1. Fact-= make; do，{变化型} fect.
高考：fact; factor; factory; difficult; affect; affair; defeat
TOEFL: manufacture; faculty; infect; deficient; magnificent; proficient; sufficient; feasible; SAT: faction; benefactor; facile; facility; facsimile; affectation; affection; defect; effectual; imperfect; efficacy; efficient; profitable; feature; counterfeit; surfeit
2. Sist-, st-+ vowel= stand, 衍生出“静止”，“持续”，“固定”，“隐忍顺从”之意.8
高考：assist; assistant; consist; exist; existence; insist; resist; institute; stage; state; station; constant; distance; system
TOEFL: consistent; persist; irresistible; substitute; stable; establish; contrast; obstacle; static; statistics; statue; status; estate; steady; destine; destiny; destination; distant; substance; restore;
SAT: subsist; constitute; constitutional; restitution; superstition; obstinate; statement; statute; steadfast; extant; instant; substantial; stall; install; apostasy; ecstasy;
3. Pose-= place; put.
高考：pose; position; post; postage; expose; purpose; suppose; pause
TOEFL: positive; compose; composition; decompose; deposit; dispose; exposure; exposition; oppose; opposite; propose;
SAT: apposite; composure; depose; disposition; impose; impostor; predisposition; proposal;
4. Ply-= fold. {变化型} pli, ple.
高考：apply; exploit; employ; employee; employer; simple;
TOEFL: applicable; applicant; application; imply; implicit; replicate; complicated; complex; explicit; display; diploma; diplomatic; multiply
SAT: pliable; implicate; complicity; explicate; perplex; supplicate; deploy; simplicity; duplicate; triple;
5. Vers, vert-= to turn5
高考：advertise; universe; university
TOEFL: version; vertical; vertigo; vortex; adverse; adversary; adversity; anniversary; divorce; reverse
SAT: versatile; vertex; avert; averse; aversion; controvert; incontrovertible; converse; convert; diverse; divert; diversion; extrovert; inadvertent; introvert; invert; inverse; pervert; perverse; revert;
6. Vid, vis-= to see6
高考：visa; vision; visit; advise; advice; provide; television; interview; review;
TOEFL: visible; invisible; visual; visualize; evident; evidence; evidence; prudent; supervise; supervisor;
SAT: visionary; envy; invidious; improvise; providence; improvidence; provision; purveyor; revise; surveillance; survey;
7. Act-= act 3
高考：act; action; active; actual; exact; exactly; TOEFL: activate; transact; agency; agent; agile;
SAT: enact; exacting; exaction; inaction; interact; agitate; agony; cogent; cogitate; prodiga l
8. Cede-= go; yield. {变化型} ceed, cess.
高考: succeed; success.
TOEFL: access; accessible; exceed; excess; proceed.
SAT: accede; antecede; cede; cessation; exceedingly; incessant; precede; procession; recede; recession; secede; secession; successive.
9. Ceive-= take. {变化型} cept, cip, cipate5
高考：accept; except; receive; receipt.
TOEFL: conceive; concept; conception; deceive; deception; deceptive; perceive; perceptive; reception; anticipate; participate.
SAT: deceit; exceptionable; inception; perceptible; precept; recipient; susceptible; emancipate.
10. Fer-= carry, bear6
高考：ferry; different; offer; prefer; suffer.
TOEFL: fertile; fertilize; circumference; conference; differentiate; infer; inference; preferable; refer; transfer.
SAT: defer; deference; indifferent.
11. Miss-, mit-= send, throw5
高考：missile; message; admit; admission; commission; dismiss; permit; promise; TOEFL: mission; commit; compromise; emit; emission; promising; submit; transmit. SAT: missionary; demise; intermit; omit; omission; premise; remission; surmise.
12. Passi- = suffer, feelings. {变化型} pati-, path-3
高考： patient; patience;
TOEFL: passion; passionate; passive; compassion; sympathetic; sympathy
SAT: dispassion; impassion; impassive; impatient; compatible; incompatible; pathos; pathetic; pathology; antipathy; apathy; empathy;
13. Spec-= see; look 5
高考：spy; species; special; scope; expect; inspect; respect; suspect.
TOEFL: specimen; spice; spectacle; spectator; speculate; conspicuous; despise; despicable; despite; aspect; circumspect; perspective; prospect; suspicious.
SAT: specify; specific; specious; spectrum; perspicacious; introspect; inconspicuous; retrospect;
14. Tain-= hold; keep. {变化型}ten, tin 5
高考：continue.
TOEFL: contain; content; continental; entertain; maintain; obtain; sustain; sustainable; sustenance.
SAT: tenable; tenacious; tenacity; tenet; tenor; tenure; abstain; abstinence; container; countenance; impertinent; obtain; sustain; sustainable.
15. Tend-= stretch. {变化型}tens, tent
高考：tense; tent; attend; attention; intend; pretend. TOEFL: tendency; intense; intent.
SAT: tensile; contention; contentious; distend; extend; extent; intentional; ostensible; portend; pretentious; superintend.
16. Altar-= other. {变化型} altr, ali3
高考：
TOEFL: alter, alternate, alternation, alien.
SAT: altercation, alternative; altruism; alienate; alias; alibi; adulterate.
17. Cad-= fall. {变化型}cid, cas
高考：accident; coincidence; case. TOEFL: occasional.
SAT: cadence; decadence; deciduous; incidence; incidental; cascade; casualty.
18. Cern-= separate. {变化型} cret6
高考：secret; secretary.
TOEFL: concern; discern; discreet; discretion; secretion. SAT: discrete.
19. Clud-= shut; close, {变化型}claus, close, clus.
高考：close; conclude; conclusion; include; inclusion. TOEFL: closet; enclose; conclusive; exclude.
SAT: clause; claustrophobia; exclusive; preclude; recluse; seclude; cloister.
20. Cre-= make; grow. {变化型} cresc
高考：create; creative; decrease; increase.
TOEFL: creature; concrete; concretion; re-create; recreation. SAT: accretion; decrepit; increment.
21. Cur-= run. {变化型}course
高考：occur; occurrence. TOEFL: current; curriculum;
SAT: concurrence; cursive; cursory; discursive; excursive; incur; incursion; precursor; recur; recurrent; discourse; intercourse; recourse.
22. Duce-= lead. {变化型} duct.2
高考：conduct; conductor; introduction; produce; product; production; reduce