1)动词+不定式
afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake
举例：
Thedriverfailedtoseetheothercarintime.
司机没能及时看见另一辆车。
Ihappentoknowtheanswertoyourquestion.
我碰巧知道你那道问题的答案。2）动词+不定式； 动词+宾语+不定式
ask,beg,choose,expect,hate,helpintendlike,love,needprefer,prepare,promise,want,wish…
Iliketokeepeverythingtidy. 我喜欢每件东西都保持整洁。
Ilikeyoutokeepeverythingtidy. 我喜欢你年使每件东西都保持整洁。
IwanttospeaktoTom. 我想和汤姆谈话。
IwantyoutospeaktoTom. 我想让你和汤姆谈话。3）动词+疑问词+to
decide,know,considerforget,learn,remember,show,understand,see,wonder,hear,findout,explain,tell
Pleaseshowushowtodothat.请演示给我们如何去做。
Therearesomanykindsoftape-recordersonsalethatIcan'tmakeupmymindwhichtobuy.有这么多的录音机，我都拿不定主意买哪一种。注意:疑问词带不定式在句中作成分时，谓语动词用单数。
Thequestionishowtoputitintopractice.
问题是怎样把它付诸实施。
