写出下列词的正确形式

　　 第三人称单数 现在分词 过去式 过去分词

ring　　________ ________ ________ ________

用下列动词的正确形式填空

They asked me where I ________(be) during my stay in New York.

用下列动词的正确形式填空

By the time she ________(know) the fact, they ________(announce) it for a month.

用下列动词的正确形式填空

Tom ________(learn) Chinese before he ________(come) to China last year.

用下列动词的正确形式填空

By the end of last term we ________(read) several English story books.

用下列动词的正确形式填空

When I ________(get) home, I ________(realize) I ________(leave) my umbrella in the school.

用所给单词的适当形式填空

Lucy always likes the clothes that ________(be) quite different from others'.

用所给单词的适当形式填空

There is someone knocking at the door. It may ________ (be) the postman.

用所给单词的适当形式填空

If I ________ (have) a pair of wings, I would fly in the sky like birds.

用所给单词的适当形式填空

The government doesn't allow parents ________(leave) their little children at home alone.