7.It’smoredifficulttopracticeinwinter…,soitisimportantnottobelaterforafter-schoolpractice,Itisgoodtohaveourfansaround.这三个句型结构相同,是什么句型结构?

Question

7.It’s more difficult to practice in winter…,so it is important not to be later for
after-school practice,It is good to have our fans around.这三个句型结构相同,是什么句型结构?

Answer 1

都是主系表结构.其中：
it是形式主语,真正的主语都是最后的不定式.
is是系动词.
形容词作表语.