Why don't you join us? 为什么不加入到我们当中呢？

Sure, I'd  love to. 好的，我很愿意的！

Would you like to come with us? 你想和我们一起来吗?

Next Sunday we are going to hvae a picnic in the park. Would you like to come with us? 下周我们要到公园去野餐，你想和我们一起来吗？

I'd love to! 我非常愿意！