i think you should write " they explored Mars in Utah"
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DanilI mean, If I want to say in past simple tense, should I write verb "are"No. Forms of be (am, is, are, was, were) are not used in forming the simple past of other verbs.
CalifJimYou can't explore Mars while you are in Utah, though. That's like visiting Moscow while you are in London.
Danilwhy you doin't use be in the present simple?Then it wouldn't be "simple". The simple forms don't use be. The continuous forms use be and -ing on the verb.
DanilWhat is the difference between: "They explore." and "She is an author"The main verb is "explore" in "They explore". It's an action verb. It tells what action they do.
CalifJimThe main verb is "explore" in "They explore". It's an action verb.I think, I have understood. When I use action verbs I must write them only in the present simple?
DanilWhen I use action verbs I must write them only in the present simple?Action verbs don't use with the continuous tenses? Only in the present tenses?You need to get a grammar book and study the tenses.