用简单的英语解释下列句子【就是句型转换】
I am interested in playing basketball
Peter 【is interested in】 playing tennis
How can trees help 【each other】
The rubber on the end of the pencil 【is from】trees
You should【 look after】your pet
Please pass me some salt
That computer is Amy's
The doctor warned the patient not to smoke
I don't know how I should use your mobile phone
【注：框住要专门解释】