Fill in the blank with correct form of verb:Mary ____ to Australia for a while but she’s back again now. (go)

The correct answer is: has gone.

The sentence is in the past tense, so we need to use a past tense verb. The other options are not in the past tense:

• went is the simple past tense of the verb “go”. It is used to talk about something that happened in the past.
• is going is the present continuous tense of the verb “go”. It is used to talk about something that is happening now or that is going to happen in the future.
• will go is the simple future tense of the
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  verb “go”. It is used to talk about something that is going to happen in the future.

In this case, we know that Mary went to Australia for a while and is back again now. This means that she went to Australia in the past and is back now. So,

Here are some other examples of how to use the past tense:

• I went to the store yesterday.
• She was born in 1990.
• We played soccer last weekend.