彼がいつ現れるのかよく分からない。の英語

I'm not sure as to when he will turn up.

I'm not sure when he'll turn up.

There is no telling when he will show up.

There's no telling when he will show up.

I am not sure when he will come.

I'm not sure when he'll come.

I don't know when he will come.

I don't know when he's coming.

I don't know when he'll come.

I don't know when he will come.

There is no telling what time he will come.

I do not know for certain when he will come.

I don't know when he will come.

I don't know when he'll come.

I don't know for certain when he will come.

I don't know for certain when he will come.

I don't know when he will come.

I don't know for certain when he will arrive.

I don't know when he will come back.

I don't know when he'll come back.

I don't know when he will come back.

I don't know when he'll come back.

I don't know when he'll come again.

I don't know when he will return.

I don't know when he is going to come back.

I don't know exactly when he will arrive.

I don't know when he will return.

I don't know when he'll be back.

I don't know for certain when he will arrive.

I am uncertain when he will come next.