1.pretend to do
seem to do
两个to 后面都要接动词原型,所以如果是am is are,要写成原型be
2.为什么要有be?
根据句子意思,不定时后面用的是进行时,正在做什么什么,所以用进行时be+doing
这就是为什么在这儿有个be 了,如果真要命名,我们可以叫做助动词
不定式语法问题The boy pretended to be working hard.He seems to be r
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