4a. John has become a rather good actor. 4b, John has became a rather good actor.

Using regular and irregular verbs. I choose b.
5a. Some athletes have taken drug test to prove they are not on steriods.
5b. Some athletes have took drug tests to prove they are not on steriods.
7a. I was interested in working on the presidental campaign if the opportunity still exist.
7b. I am interested in working on the presidentsl campaign if the opportunity still exists.

I choose b for nuber 5

I choose a for number 7

4. b. is correct.

5. b. is correct.

7. a. is incorrect. There are two reasons. Do you see them?

I put a for number 4 and I also choose a for number five. I am confused here.

no I don't see what your are talking about. I think that I have all of the rest wrong too.

4a. John has become a rather good actor. 4b, John has became a rather good actor.

Using regular and irregular verbs. I choose b.
4.a. is correct because the verb "to become" is an irregular verb in its past participle form, in this case being used with the helping verb "has." With that particular helping verb, you must always use the past participle form of the verb. Here are the primary forms of "to become":
== become = present
== became = simple past (never used with any helping verbs)
== become = past participle: can be used with forms of "to be" and "to have" as helping verbs; can also be used as a verbal adjective (which is what a participle is).

Here are some good explanations within these quizzes:
http://grammar.ccc.commnet.edu/grammar/verbs.htm#irregular

And here is a good chart that can help you identify irregular verbs and how to use them:
http://grammar.ccc.commnet.edu/grammar/irregulars.htm


5a. Some athletes have taken drug test to prove they are not on steriods.
5b. Some athletes have took drug tests to prove they are not on steriods.
5.b. is correct because of the word "tests" - the subject is "athletes," right? Plural athletes would not take a single (singular, one) test. Each must take his/her own.

7a. I was interested in working on the presidental campaign if the opportunity still exist.
7b. I am interested in working on the presidentsl campaign if the opportunity still exists.
7.b. is correct for two reasons:
== "I am" is the correct verb tense (present) to pair up with the other verb in the sentence: "exists." Both are singular; both verbs are "acting" at the same time.
== The verb "exists" is correct because it's a singular form and is in agreement with its subject, "opportunity," which is also singular.

Questions?

4b is incorrect... has became doesn't work... it has to be either has become or became.

Thanks very much. How can I get someone to check the rest of the questions for me.

Please use the Post a New Question link above to post new questions.

=)

"have took" Is that really correct English??? (5b)

Shouldn't it be either "took" or "have taken"?????

3a. Vitamins that are sold in a health-food store are not regulated by the Food and Drug Administration.

3b. Vitamins that are sold in a health-food store is not regulated by the Food and Drug Administration.