For the first sentence, there are several options. As Gary noted, you did not include a critical part of the verb. Two simple options are: "he IS always changing the channel," (present tense) or "he WAS always changing the channel" (past tense). If you remove the adverb, "always," then the you will see that the "verb" in fact is composed of two parts: "is changing" (which indicates continuous action in the present tense ) or "was changing" (which indicates continuous action in the past tense. The "verb" consists of both words but the first word indicates whether the action is in the present or was in the past. Note that there are other verb tenses in English that use a verb ending in "ing" TOGETHER WITH other words before it. For example, "he has been changing the channel for the past half hour, trying to look at two programs at the same time," or "he had been changing the channel when he heard a knock on his door. Thus, in English " a "verb" is not only a single word in some tenses. The second sentence doesn't make sense but not because of the verb. First, since "star" refers to a countable object, if you want to talk about it generally, it should be plural (stars). Moreover, since "star" can refer to an object in the sky or an esteemed person in a profession, it is important to describe what kind of star you are talking about: for example, movie star, pop star, or opera star? If a previous sentence provided some context, then the meaning would be clear. Context would also explain WHERE you are "seldom watching" "American "stars" -- that is, on the street, on film, in the newspapers, on TV? . I am guessing that you more likely mean tat you are not interested in American movie, pop or opera stars and seldom follow the gossip about them that appears in newspapers.

Ok thank you so much Mr.Gary for the reply

It's a bit hard to tell. You left the verb out of 1. That's the critical word!