哎呀！我本打算 今天上午给他写信，后来就全忘了。

Oh dear! I was writing him a letter this morning and forgot all about it.

youdao

我忘了以前曾写信给他。

I forgot writing him a letter.

youdao

我本打算今天上午给他写信，后来就全忘了。

I was writing him a letter this morning and forgot all about it.

youdao

我本该今天早上给他写信的，后来全给忘了。

I was writing him a letter this morning and forgot all about it.

youdao

我本该今天早上给他写信的，后来全给忘了。

I was writing him a letter this morning and forgot all about it.

youdao