邀请老外去吃饭,一般有以下常用句式：
I wonder if you have time this evening?
我想知道您今晚是否有空?
Would you be interested in dinner with me
今晚能请您吃个饭吗?
Which kind of restaurant do you prefer,Chinese or Western?
您喜欢去中餐厅还是西餐厅呢?
I'll pick you up at 7:00 pm,if it's ok with you.
如果合适的话,我晚上7点去接您.