1、It was a happy day.
2、It is kind of you to help me .
3、It was lucy who finished the work
4、It is a small room.
5、It is on the bed,
6、It is a nice dress.
7、It is late to school.
8、It is time to go to bed.
It pron. (代词)
它。
这。
那。
作无人称动词的主词。
谈论时间、日期、距离、天气等时用作主语。
置于句首或句中，引导后面的片语或子句。
作为形式上的主词或受词。
用于表示强调的句型中。
用于某些动词、 介系词后面。
词义含糊。
构成习惯语。
指婴儿，尤指性别不详者。
用以明确身分。
用作形式主语或形式宾语，而真正的主语或宾语在句末。
指已知或正在发生的事实或情况。
作加强语气的谓语代词，指被认为是最终的，最后的或完美的、绝妙的人、事物、形势等。
作强调的代词，指人们有吸引力的品质，如活力、魅力、性吸引力。
查看更多abbr. (缩略词)。=information technology 信息技术，情报技术学。
例句：
It is time to be old,to take in sail.
Now it is time to find common ground.
Now it is time to think about the implementation.
It is high time to begin our plan.
Ladies and gentlemen,it is time to begin.
Stand by,men; it is time to begin the attack.
It is time to start work on my thesis.
You have pondered long enough; it is time to decide
How will I know when it is time to board?