Combining the two sentences by using a conjunct:

Question

Officially, he is in charge.His secretary does all the work.
用but可以吗？
Officially, he is in charge.But,his secretary does all the work.

Answer 1

可以用but，但是应该这样：
Officially，he is in charge，but his secretary does all the work.
but 后不用逗号，直接接句子。如果用however，则在其后加逗号。
望采纳

Answer 2

用but也是可以的，单单看这两句话。
翻译为：
官方上，他是主管，但是他做的是保密工作。

希望能帮到您！

Answer 3

可以用but，但是应该这样：
Officially，he is in charge，but his secretary does all the work.
but 后不用逗号，直接接句子。如果用however，则在其后加逗号。

Answer 4

可以用but，意思没变。