直到,2 o clock this morning that Mike came back home直到,用it is not until还是not until.为什么?

直到,2 o clock this morning that Mike came back home直到,用it is not until还是not until.为什么?
直到,2 o clock this morning that Mike came back home
直到,用it is not until还是not until.为什么?

直到,2 o clock this morning that Mike came back home直到,用it is not until还是not until.为什么?
it is not until
这样才是强调句
it作主语 否则没有主语了

didn't come back until 2o'clock

直接用till就可以，Mike came back home till 2 o clock.

it wasn't until啊...
sweat...