makesb.dosth.

　　letsb.dosth.

　　decidetodo

　　lookforwardtodoing(to作介词)

　　needtodo

　　wanttodo

　　begin/starttodo

　　remembertodo/doing

　　forgettodo/doing

　　Ittakessb.sometimetodo

　　whynotdo?

　　whydon'tyoudo

　　what/howaboutdoing?

　　hatetodo

　　like/love/enjoydoing

　　besuretodo

　　can/could/must/may/mightdo

　　seemtodo

　　stoptodo/doing

　　learntodo

　　keepdoing