I’d like to make an appointment with you. Could you make a time? 我想约你。你能定个时间吗？

Yes. Would next Monday be all right with you? 好的，你觉得下周一怎么样？

Do you have any plans for this Sunday? 这个星期天你有安排吗?

Do you have any plans for this Sunday? 这个星期天你有安排吗？

I’ve got no plan yet. 我还没打算呢。

Well, would you like to come with us for a picnic?  那和我们一起去野餐怎么样？

That would be great! 好啊！