"I want to watch TV" 是表达想看电视的常用说法。
"Watch" 是动词，意思是"看"。"TV" 是缩写词，是"television" 的缩写，意思是"电视"。
例句:
I want to watch TV for a pttle while. (我想看会儿电视)
Can you turn on the TV? I want to watch the news. (你能打开电视吗？我想看新闻)
I can't work with the TV on. It's too distracting. (我不能在电视开着的情况下工作，太分心了)