The question is whether we can reduce the cost of the product.
My suggestion is that we (should) have a discussion about this matter instead of just laying it aside.
The reason for such a serious accident is the driver was too careless and drunk.
This is what I am interested in.
That was where we camped last time.
The question is however we can do the work better.
四、because，as if，as though，as，like等连接词也可以引导表语从句。
He has heart disease.That is because he has been smoking too much.
The question remains whether they will be able to help us.