Bare infinitive SỬ DỤNG trong các cấu trúc sau:



** S au các động từ khuyết thiếu : can, may, might, must, will, shall, ……………
Ex: I can speak English
** Sau các động từ chỉ cảm quan ­: see, look, hear, feel, notice, watch, observe, overhear …..hoặc các từ như: make, let. have........
Ex: I saw her get off the bus
Chú ý khi động từ này ở thể bị động thì dùng to infinitive.
Ex: She was seen to get off the bus
** Sau các ngữ động từ như­: had better, would rather, had sooner, ……….
** dùng trong cấu trúc: : Thức mệnh lệnh
V + O , please.

Ex: Go out, please.


To infinitive được dùng trong các cấu trúc :



a. Infinitive after V ::
want, hope, volunteer , promise, mean, plan , expect, propose, stop, threaten, argree, decide, arrange, refuse, try, manage, offer, remember, attempt, begin, care, claim, continue, deserve, determine, demand, desire, fail, fear, forget, intend, learn, need, pretend, prepare, swear, ………….
b. Infinitive used after Object ( S+ V+ O +to infinitive)
advise, allow, ask, beg, believe, consider, enable, encourage, expect, forbid, force, get, guess, instruct, intend, invite, order, permit, persuade, tell, help, recomment, remind, call on, warn, urge,………
c.Infinitive used after đại từ bất định : nothing, anything, something, someone, everyone, everything, noone, ….
d. Infinitive used in following structure

** It’s + adj + to V ( chủ ngữ giả )
Ex: It is very dificult for me to learn English.
** It’s + N+ to V
Ex: It is a pleasure to go for a walk with you.
** It takes / took / will take + O+ time+ to V
** S+ be / v + too+ adj / adv+ ( for O) + to V
** S + tobe / v + adj / adv + enough+ ( for O) + to V
** To infinitive dùng để chỉ mục đích
e.Infinitive used after number: the first, the second, the third,……. The last.