by the time+過去時(shí)間，主句過去完成。by the time+將來時(shí)間，主句將來完成時(shí)等。還有一種情況就是不強(qiáng)調(diào)已經(jīng)完成，只強(qiáng)調(diào)某一時(shí)期的具體情況，相當(dāng)于when。

by the time的用法時(shí)態(tài)是什么

by the time的用法時(shí)態(tài)是：by the time+過去時(shí)間，主句過去完成。by the time+將來時(shí)間，主句將來完成時(shí)。到……為止

如果從句中的謂語(yǔ)動(dòng)詞是一般過去時(shí)，那么主句中的謂語(yǔ)動(dòng)詞通常用過去完成時(shí)，表示“截止到從句動(dòng)作發(fā)生時(shí)，主句動(dòng)作已經(jīng)完成，即過去的過去”。

He had left by the time we reached home.

當(dāng)我們到家的時(shí)候他已經(jīng)走了。

如果從句中的謂語(yǔ)動(dòng)詞為一般現(xiàn)在時(shí)／或現(xiàn)在完成時(shí)（表示將來），那么主句中的謂語(yǔ)動(dòng)詞常為將來完成時(shí)，表示“截止到將來某一時(shí)間為止，主句動(dòng)作將已經(jīng)完成”。

by the time的雙語(yǔ)例句有哪些

1、By the time Alexandra was seven years old, she had begun painting with oil paints.

Alexandra七歲的時(shí)候，就開始用油畫顏料畫畫了。

2、By the time I sit down and facetheblank page I am raring to go.

等到我坐下來面對(duì)一張白紙，我已經(jīng)迫不及待地想要?jiǎng)庸P了。

3、By the time oftheApollo program,thequality and variety of food increased even further.

到“阿波羅”計(jì)劃時(shí)，食物質(zhì)量和花樣都進(jìn)一步提高和增多。

4、By the time Lizette reachedthelichen meadow,thesun was up andtherocks were warm.

當(dāng)莉莎特來到草場(chǎng)的時(shí)候，太陽(yáng)已經(jīng)升起來了，巖石都是溫暖的。

5、By the time Cadieux tookthecase,thepolice had long since openedthemissing persons case.

到卡接手的時(shí)候，警局已經(jīng)在這失蹤案件上磨蹭很久了。