1.It is very important to keep our environment clean and tidy.这句中it做形式主语,真正的主语是"to keep our environment clean and tidy"这个动词不定式.2.It is the person who you want to look for.It强调句做形式主语.
1.It is very important to keep our environment clean and tidy.这句中it做形式主语,真正的主语是"to keep our environment clean and tidy"这个动词不定式.2.It is the person who you want to look for.It强调句做形式主语.