13. I am not accustomed to using the knives.
我不习惯使用叉子。
还能这样说：
I am not used to eating with knives.
I cannot get used to using knives to have dinner.
应用解析：
be accustomed to 习惯于……;
accustom oneself to 使自己习惯于……
14. It is not polite to blow your nose when people have dinner.
吃饭时擤鼻涕是不礼貌的。
还能这样说：
It is a bad manner to blow your nose at table.
It is considered as impolite to blow your nose at table.
应用解析：
do the polite 举止优雅;装作彬彬有礼的样子
15. I like to have dinner while watching TV.
我喜欢边吃饭边看电视。
还能这样说：
I tend to have dinner in front of the television.
I love to watch TV over dinner.
16. It is good to drink some water before dinner.
吃饭前喝点水很好。
还能这样说：
It does good to you to drink some water before the meal.
Drinking before dinner is good for your health.
谚语：
Draw water with a sieve.
竹篮打水一场空。
17. I like buffet best.
我最喜欢吃自助餐。
还能这样说：
What I enjoy most is the buffet.
My favorite is buffet.