帮我看看这几句英语是否有语法错误
我在写一份关于“全球变暖”为话题的明信片,里面的要求不错,写几点建议就好了,也不用太多字数,下面是我写的,到时候用于公开课,恳求各位大虾帮我看看是否有语法错误,
★Don’t drive a car but walk or ride a bike.
★Use electrical appliances less often.
★Buy things which are economical with energy.
★Plant trees actively to protect our environment.