It means "when the weather is fine, I play tennis".
"I prefer to..." in English is Je préfère... in French.
Je suis... in French is "I am..." in English.
Je joue golf
It depends if you're talking about the verb to play :je joue (=I play)il joue (=he plays)elle joue (=she plays)on joue (=we play)Or the body part la joue (=the cheek)
je joue
"Can I ...?" in English is Puis-je ...? in French.
"(I) am" in English is (Je) suis in French.
Je travaille! in French is "I'm working!" in English.
Je joue
Je joue
I play