How to use 'if so' and 'if not' in dialogue.

A conditional clause to refer a previous direct or indirect 'yes-no' question where the answer might be ‘yes’. 

Do you think we could study more grammar? If so, could you give us more help with tenses?

Is it possible to pay by credit card? If so, which card do you accept?

Does Mrs Smith like wine? If so, does she prefer white or red?

Could you tell me if she said anything about me? If so, what did she say?

I was wondering if we could meet one morning. If so, which day would you prefer?

Is this shirt your size? If not, we have plenty of other sizes.

Do you open at the weekend? If not, how can I pick up the vacuum cleaner I bought online?

I hope next Saturday is ok for you. If not, we can find another date for the excursion.

I'd like to know if we'll be going to the beach when I arrive. If not, what plans do you have?

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