To watch a competition in English, you can say "to view a competition" or "to observe a competition." This phrase comes from the verbs "to watch" and "to view," which both mean to look at something with attention.

Here are some example sentences in English with Chinese translations:

I love to watch competitions on television. (我喜欢在电视上看比赛。)

He is a skilled observer of competitions. (他是一名熟练的比赛观察员。)

She enjoys viewing competitions in person. (她喜欢亲身观看比赛。)