1. Do you like shopping online?
你喜歡網上購物嗎？
還能這樣說：
Do you prefer shopping online?
Are you interested in shopping online?
2. Have you bought anything mail-order?
你在網上買過東西嗎？
還能這樣說：
Have you bought something online?
Have you ever done shopping online?
3. I purchase products or serives online at least once a week.
我每周至少有一次在網上購買產品或服務。
還能這樣說：
I buy things through the internet at least once a week.
I buy products online at least once a week.
應用解析：
purchase and sale 買賣；
make a purchase 買件東西；
leave sb. to his purchase 讓某人自謀生路；
not worth an hour's purchase 生命危在旦夕
4. Let's search online to find an appropriate cell phone.
我們上網找一款合適的手機吧。
還能這樣說：
Let's buy an appropriate cell phone online.
Let's buy a cell phone through the internet.
應用解析：
appropriate to/for 適合，適用；
appropriate for 撥出（款項等）供……之用