2.if you (eat) an ice-cream, i (have) a hot chocolate. 3.if she (need) a computer, her brother (give) her his computer. 4.if we (have / not) time this afternoon, we (meet) tomorrow. 5.he (talk) to her if you (want / not) to do it. 6.you (win / not) the game if you (know / not) the rules.

2.If you (eat) an ice-cream, I (will have) a hot chocolate. 
3.If she (needs) a computer, her brother (will give) her his computer. 
4.If we do not (have time this afternoon, we will meet) tomorrow. 
5.He (will  talk) to her if you do not want to do it. 
6.You will not win  the game if you do not know the rules.