it is hard to后跟动词不定式还是动词的ING形式

it is hard to后跟动词不定式还是动词的ING形式 it is useless 后跟动名词还是不定式 it's hard to navigate.中的to navigate是动词不定式吗?hard是什么成分? 哪些动词后跟动词不定式 It+is+easier+to+ride+a+bike+than+.than后跟什么是不定式还是动名词 请求动词后跟不定式的动词、动词后跟动名词的动词例如decide to do 和 practice doing our government is working hard to save pandas中的动词不定式做什么成分 it is hard to believethat从句句子成分是不定式做主语还是从句做主语 it is hard to say 中的不定式做了什么成分 It is hard to it's hard to breathe是什么语法现象?是非谓语动词——不定式的什么用法? try one's best 后跟动词不定式,要省略to吗? It is polite to say “Thank you and openIt is polite to say “Thank you and open doors for people.老师说用动词不定式,为什么是动词不定式,动词不定式一定要两个动词吗? It is time to have lunch 为什么be后面不跟动名词而更动词不定式 ask sb.后跟动词不定式还是跟动词原形 It is hard to wait It is hard to please It is hard to select!