那就是的英文可以写成that is，That is to say，Someone等，详细介绍如下：
1、用法：在某种程度上，那就是召开这次会议的原因。To an extent, that is the reason for the meeting. 我没有说那就是事实。I'm not suggesting that is what is happening.
如果要说她有什么缺点，那就是她的意大利语不大行。If she has any weakness, it is her Italian. 如果有人该承担责任，那就是我。If anyone's to blame, it's me. 对这一状况不闻不问，那就是不负责任。It would be irresponsible to ignore the situation.
2、双语例句：要说我从未看到过，那就是言不由衷了。It would be disingenuous of me to claim I had never seen it. 那就是我所有的一切。It was all that I had. 即使你确实看见有个人，也不能保证那就是他。Even if you did see someone, you can't be sure it was him.
有一点我能肯定，那就是她当时被吓到了。One thing I am sure of was that she was scared. 那就是为什么他感到有些痛苦。That was the very reason why he felt a certain bitterness.
小火车君
