谓语动词的形式
have+过去分词。如:Many trees have been cut down since 1970s.(自从20世纪70年代大批树木被砍伐。)
一般时问句和否定句中:do/does/did+原形动词。如:He does not enjoy himself very much.(他日子过的不好。)/ Did any of you see dinosaur eggs?(你们当中有谁见过恐龙蛋吗?)
不可用形容词、名词、代词、副词、介词短语等独立作谓语,必须在此之前加连系动词。
have+过去分词。如:Many trees have been cut down since 1970s.(自从20世纪70年代大批树木被砍伐。)
一般时问句和否定句中:do/does/did+原形动词。如:He does not enjoy himself very much.(他日子过的不好。)/ Did any of you see dinosaur eggs?(你们当中有谁见过恐龙蛋吗?)
不可用形容词、名词、代词、副词、介词短语等独立作谓语,必须在此之前加连系动词。