How about tomorrow?
明天怎么样？
A: Hi, are you busy today? We can go somewhere nice.
A: 嗨，你今天忙吗？我们可以一起去个好地方。
B: Hi, Ping. I'd love to, but I have to see some friends.
B: 嗨，平。我很愿意，但是我得见几个朋友。
A: OK. How about tomorrow? Are you free?
A: 好。明天行吗？你明天有空吗？
B: Yes, tomorrow afternoon.
B: 是的，我明天下午有空。
A: Good. We'll go shopping an Wangfujing street.
A: 好。我们一起去王府井买东西。
B: That would be really nice. Thanks.
B: 那太好了。谢谢。
A: You've welcome. See you tomorrow.
A: 别客气。明天见。
Notes:
1. To ask if someone is busy, simply say：Are you busy? 要问某人是否忙，可以简单地说：Are you busy? (你忙吗?)
2. Again, to make a suggestion, use can. For example, We can go somewhere nice. 要提出建议，可以用can (可以)。例如，我们可以去一个好地方。
3. A good way to suggest a possible time to do something is： How about...? For example, How about tomorrow? 要说可能在某时做某事，可以这样表达：How about...? (...怎么样?)。例如，How about tomorrow? (明天行吗？)