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不定式动词主要包括以下类别:
1) 情态动词 ( 除ought 外,oughtto):
2) 使役动词 let, have, make:
3) 感官动词 see, watch, lookat, notice , observe, hear, listento, smell, feel, find 等后作宾补,省略to。
注意:在被动语态中则to 不能省掉。
Isawhimdance.
=Hewasseentodance.
Thebossmadethemworkthewholenight.
=Theyweremadetoworkthewholenight.
4) wouldrather,hadbetter:
5) Why… / whynot…:
6) help 可带to,也可不带to, helpsb (to) dosth:
7) but和except:but前是动词do时,后面出现的动词用不带to的动词不定式。
8) 由and, or和than连接的两个不定式,第二个to 可以省去:
9) 通常在discover, imagine, suppose, think, understand等词后,可以省去tobe:
Heissupposed (tobe) nice. 他应该是个好人。
举例:
HewantstomovetoFranceandmarrythegirl.
Hewantstodonothingbutgoout.
比较: Hewantstodonothingbutgoout.
Hewantstobelieveanythingbuttotakethemedicine.
典型例题
1) ---- Iusuallygotherebytrain.