(1)加动词原形 can/can't +动词原形 should/shouldn't+动词原形 may+动词原形 must/mustn't+动词原形 Will/won't+动词原形 do/does/did+动词原形 help+动词原形 have to+动词原形 Shall we+动词原形 Let+宾格+动词原形 祈使句动词原形开头 (2).+to+动词原形 want+to+动词原形 would like+to+动词原形 Would you like+to+动词原形 how+to+动词原形 need+to+动词原形 be happy+to+动词原形 be glad to+动词原形 be sorry to+动词原形
