Underline the verb or verb phrase in each sentence. Then identify the principle part used to form the verb.

1. I write a column for the school newspaper. -underline write and this is present
2. Gary waited half an hour for the bus. -underline waited and this is past
3.Karen is visiting her relatives in Iowa. -underline is visiting and this is present participle
4. Are you listening to the explanation.?-underline listening and this is present
5. The speaker had paused for a moment. -underline had paused and this is past participle

Please review the above and let me know if there are any mistakes or errors

In 3 and 5, "visiting" and "paused" are the participles, not "is" or "had". "is" is present tense, "had" is past tense. You have correctly identified the phrases. The others are correct.

Your identification of the verbs and their principle parts is correct. Here is the reviewed version:

1. I write a column for the school newspaper. - The verb is "write" in the present tense.
2. Gary waited half an hour for the bus. - The verb is "waited" in the past tense.
3. Karen is visiting her relatives in Iowa. - The verb is "is visiting" in the present participle form.
4. Are you listening to the explanation? - The verb is "listening" in the present tense.
5. The speaker had paused for a moment. - The verb is "had paused" in the past participle form.

There are no mistakes or errors in your identification. Well done!