Unit 342
I can't tell you two apart.
to tell A and B apart 分别A与B的不同
I can't tell John and Devid apart.
Actually I think the I'm cross-eyed（斗鸡眼的）, I've been doubled.
Sally and I are twins.
No wonder.
He is my twin brother.
She is my twin sister.
No wonder you look so much alike.
It is said that he was sick.
No wonder he didn't attend the meeting.
it is said 据说，听说
It is said that father is coming today.
It is said that she lives there.
No wonder he didn't go to the meeting.