4. I'd be happy to..., if you'd like. 如果你愿意，我很高兴……
◆ 疯狂操练
I’d be happy to show you around, if you’d like.
（如果你愿意，我可以陪你逛逛。）

◆ 疯狂实战
A: I’d be happy to help you with your English, if you’d like.
B: Do you mean it? That would be wonderful!
A: 如果你愿意，我可以教你英语。
B: 你说话当真？那太好了！