用when,before ,by the time造句15句，过去完成式，急急？

By the time:

用already造句_用readable造句

1.By the time that the teacher explained this question to us,I had already sloved it.

2.By the time you arrived here,he had left.

3.By the time they went to home,the fire had been put off.

4.By the time everyone knew the truth,I had admitted my mistake to my teacher.

5.By the time we arrived at the cinema,the film had started.after:1.After you knew that,it had been too late.2.After they found the key to the door,the owner of the house had been back.3.After I realized its importance,it had been too late.4.After we finished our work,it had been 11 o'clock in the night.5.After she told me to throw away those clothes,I had already washed them. when:I had finished my homework when Mum came back.

once+n,sth now造句？

nce supervised by teachers and principals, they now appear to be in "self care”.

他们曾经受到老师和校长的监督，现在却像是在“自我照顾”。

Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal.

曾经主要由青少年购买的口香糖，现在在广告中被用作饭后的口气清新剂和牙齿清洁剂。

This used to be an agricultural area and we already know that where the main lecture hall now stands, there once were farm house and barn that were erected in the late 1700s.

这曾经是一个农业区，我们已经知道，现在主演讲厅所在的地方曾经有建于18世纪晚期的农舍和谷仓。

It had, apparently, been fished out of existence; and the once might Newfoundland fleet now gropes about frantically for crab on the sea floor.

显然，由于捕捞，它已经灭绝了；而曾经很强大的纽芬兰舰队现在在海底四处搜寻疯狂地找蟹。

Boys, for example, cry only about a quarter as often as girls once they reach teenage years, and we all cry a lot less now than we did as babies .

例如，男孩一旦到了青春期，哭的次数只有女孩的四分之一，此外我们现在哭的次数比婴儿时期要少得多。

The prince took heart at once—he felt that his troubles were at an end, now.

王子立刻振作起来——他觉得他的苦难已经结束了。

Now there was once a maiden whose name was Jorinda.

从前有个姑娘名叫约丽

Now and again, he disappeared only to reappear once more.

他时而消失，时而又出现

Now, once we have made a choice then we can define the flux integral.

一旦我们做出了选择，同时也就可以定义通量积分。

Once I had multiple personalities, but now we are feeling well.

我曾经有多重人格，但现在我们没事了。