都有什么词后面需要加动词原形答:情态动词 比如can,must,shall,should,will,would,may,might等等.一般来说to后面也加动原.但也有例外,比如 look forward to doing.渴望做某事.还有一些固定短语.比如,stop to do,It is time to do..等等
哪些单词后面要用动词原形? 哪些单词后面是ing形式?答:情态动词和助动词后面一定用动词原形,如can,may, must ,do , does, did 等。be动词后可以用ing形式。如:is studying, are standing, am sitting 等。另外后接ing的动词必须记(没有规律),如:enjoy , admit , appreciate, keep, finish , mind …...