Now we can watch both you on television at the same time.

应该改为：Now we can watch both of you on television at the same

参考译文：现在我们可以同时在电视看见你们2个人。

both 后面接代词，必须加介词of,但是接名词，可以不用介词of

(1)Both of +宾格代词（复数）

Both of you will stay in the hotel.  

这样的话, 你们俩就都待在旅馆里了.

He has done more than both of you have done together.  

你们俩还抵不上他一个人干得多呢.

Both of you have to discard prejudices before reaching agreement. 

你们双方只有放弃偏见才能达成一致.

(2)both of the+名词

He gave both of the children a good smacking.  

他把两个孩子都狠揍了一顿。

In my opinion both of the drivers were at fault.  

在我看来,两位司机都有责任.

Both of the dead men were identified as from No 15 squadron.  

两名死者都被认出是15中队的.

(3)both the +名词

We want to cooperate with both the admi-nistration and Congress. 

我们既想与政府合作，也想与国会合作。

Both the petitioner and respondent provide for the upkeep of the children.  

离婚上诉方和被告方共同抚养子女。

Maria loved both the children. There was never a hint of favouritism. 

玛丽亚对两个孩子都疼爱有加，向来一视同仁。

Both the horses were out, tacked up and ready to ride.  

两匹马都牵出来装上了马具,可以骑了.

(4)you both

"Well, I'll leave you both, then," said Gregory.  

“好吧,那我就不打扰你们俩了.”格雷戈里说道.

Whatever is the matter with you both?  

你们俩究竟怎么回事？

I wish you both a very good journey.  

我祝愿你们两人旅途愉快。

We wish you both health and longevity.  

我们祝愿您二位健康长寿。