People talk about the weather so often for several reasons. First of all, it is a topic that we all have in common and we can talk about, so if you meet a stranger or if you are introduced to someone, talking about the weather is the perfect way to start a conversation. Secondly, the weather changes every day and it influences practically everyone. The changeable weather is one of the typically British things, that is why they like this topic so much. Thirdly, the weather is a neutral topic that can't offend anybody. Just think about discussing sports or politics...
Mike left school in 1999.
Did Mike leave school in 1999?
Mike left school in 1999, didn't he?
Who left school in 1999?
Did Mike leave school in 1999 or in 1998?
He has drunk too much coffee today.
Has he drunk too much coffee today?
He has drunk too much coffee today, hasn't he?
Who has drunk too much coffee today?
Has he drunk too much coffee or tea today?
When has he drunk too much coffee?
The train has already left.
Has the train already left?
The train has already left, hasn't it?
What has already left?
