Nhờ mọi người giải mấy câu chủ ngữ giả IT cho tớ với

`4.` It is important for children to obey their parents.

`5.` To believe in everything people say is silly.

`6.` It is necessary to learn English.

`7.` To be able to speak English takes time.

`8.` To Listen to English when you’re waiting for someone is a good idea.

`9.` It is wrong to talk back to your parents.

`10.` To learn a foreign language isn’t so difficult.

`11.` It isn’t hard for me to riding a bicycle.

`12.` To understand one person isn’t easy.

`13.` It isn’t polite to asked someone’s age in American

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`->` V_ing/ To V + O + to be + adj + (for O) : làm gì thì thế nào với ai

`->` It + to be + adj + (for O) + to V_inf : thế nào (với ai) để làm gì

`-` thì HTĐ `(+)` S + am/is/are + … `->` It là ngôi thứ `3` số ít nên dùng is