第一句：I'd like to take a sightseeing tour.
我想参加一个观光游。

A: I'd like to take a sightseeing tour.
我想参加一个观光游。
B: OK, what kind of tour would you like?
好的，你想要什么样的旅游路线？
A: Are there any tours to visit the Polar World?
有去极地世界的旅游路线吗？
B: Yes, we do.
有的。

第二句：I'd like a half-day tour.
我想参加半日游。

A: Which tour would you like to take?
你想选择哪种观光游？
B: I'd like a half-day tour.
我想参加半日游。

相关的表达法还有：

I'd like to make a reservation for two this tour.
我要预订两个人的行程。
I’d like a full-day tour.
我想参加全天游。
Do you have a morning tour?
有上午的观光游吗？

词组记忆：

a sightseeing tour 观光游

句型学习：

I'd like to 我想，相当于I want to

eg. I think that's something I'd like to change in my country.
我相信，那就是我想要在我的国家作出改变之处。

eg. Let's say I pledge to run 100 miles this month. I can then enter the email addresses of people I'd like to cheer me on—my wife, my mother, my boss.
也许我发誓这个月要跑100英里，然后我就可以输入一个电子邮件地址给那些乐于鼓励我的人，例如我的妻子，我的老妈，我的领导。

小提示：
I'd like to take a sightseeing tour. 这句中to take 在双方明白所指的时候也可以省去，例如：I'd like a half-day tour.