不加介词，名词前面有this、that、next、last等修饰的时候。不需要加介词。例句：I couldn't get the car to start this morning.我今天早上没法让这汽车发动起来。
例句
I was feeling fine when I got up this morning.
今天早上我起床时感觉很舒服。
We seem to be missing some students this morning.
今天早上我们好像有几位同学没到。
There was a lot of post this morning.
今天上午邮件很多。
He was a bit off with me this morning.
他今天早晨对我有点冷淡。
She's feeling no better this morning.
她今天早晨还是不见好。