1. Do you have postcards?
你们有明信片吗?
还能这样说：
Do you sell postcards?
Are postcards on sale?
2. What kinds of postcards do you have?
你们有哪几种明信片?
还能这样说：
How many kinds of postcards do you have?
Which postcards are you selling?
应用解析：
kind of 有点儿，稍微;
of a kind 很相似的;同一类的;
in kind 以实物偿还;
be kind to 对……慈爱，对……厚道
3. Give me some postcards.
我买几张明信片。
还能这样说：
I need some postcards.
I want some postcards.
应用解析：
give ear to 倾听，发怒，听取意见;
give expression to 反映;
give lessons to 给……上课;
give notice 发布通知;
give occasion to 引发
4. I wonder if you have some postcards for teachers.
我想知道你们是否有寄给老师的明信片。
还能这样说：
I want to buy some postcards for my teachers.
I want to know if there are some postcards for teachers here.
应用解析：
be filled with wonder 感到十分惊异;
It is a wonder that... 奇怪的是;
the seven wonders of the world 世界七大奇观