don't come here！（改为肯定的祈祷句）I am waiching TV now 。（用yesterday改为过去时）

1.don't come here！（改为肯定的祈祷句）
将否定去掉，即
Please come here！

2.I am waiching TV now 。（用yesterday改为过去时）
be动词需要变化，即
I was watching TV yesterday.

（仅供参考，嘿嘿）

Come here！
I was waiching TV yesterday.

1.Please come away.
2.I was watching TV at this time yesterday.