Between my bAmong my greatest nightmares, I think the worst is the silly errors. Among my greatest nightmares, I think the worst is the silly errors.

BetweenAmong my beworst nightmares, I think the worst isare the silly errors. Among my worst nightmares, I think the worst are the silly errors.

BetweenAmong my beworst nightmares, I think the worst is thmost horrible of them are silly errors. Among my worst nightmares, I think the most horrible of them are silly errors.

Between my beworst nightmares, I think the worst is the silly errmy silly errors are the worst. Between my worst nightmares, my silly errors are the worst.

For example, I don't realize that the subject is in third person, or to have mistakes with the indefinite article, 'a/an'. For example, I don't realize that the subject is in third person, or have mistakes with the indefinite article, 'a/an'.

For example, I don't realize that the subject is in third person, or toI have made mistakes with the indefinite article, 'a/an'. For example, I don't realize that the subject is in third person, or I have made mistakes with the indefinite article, 'a/an'.

For example, I don't realize that thewhen a subject is in third person, or to have mistakes withwhen to use the indefinite article, 'a/an'. For example, I don't realize when a subject is in third person or when to use the indefinite article, 'a/an'.

For example, I don't realize that the subject is in third person, or to have mistakes withhat I've used the indefinite article, 'a/an', incorrectly. For example, I don't realize that the subject is in third person, or that I've used the indefinite article, 'a/an', incorrectly.

The second part of the sentence should be similar in structure to the first part of the sentence because it sounds much better that way. In this sentence, you're talking about things you don't realize: "I don't realize that the subject is in third person" and "I don't realize that I've used the indefinite article incorrectly," so you can merge the two sentences to make one sentence.

For example, I don'tnever realize that the subject is in third person, or to have mistakes withand always end up confusing the indefinite article,s 'a/an'. For example, I never realize that the subject is in third person, and always end up confusing the indefinite articles 'a/an'.

To forget to write the subject in a sentence, is very silly, too. To forget to write the subject in a sentence is very silly, too.

ToI forget to write the subject in a sentence, which is very silly, too. I forget to write the subject in a sentence, which is very silly, too.

To forget to writinclude the subject in a sentence, is very silly, too. To forget to include the subject in a sentence is very silly, too.

To fForgetting to write the subject in a sentence, is very silly, too. Forgetting to write the subject in a sentence is very silly, too.

Since you've already used 'to' for 'to write', it might be better to use 'forgetting' instead of 'to forget' because your sentence will sound more interesting!

ToSometimes I forget to write the subject inof a sentence, is very silly, too. Sometimes I forget to write the subject of a sentence, too.

No need to restate it is silly, it is inferred

I could follow with the choosing wrong tense verb, and so on. I could follow with choosing wrong tense verb, and so on.

I could follow with the choosing of the wrong tense verb, and so on.

I could follow with the choosing the wrong tense verb, and so on. I could follow with choosing the wrong tense verb, and so on.

I could follow up with the choosing the wrong verb tense verb, and so on. I could follow up with choosing the wrong verb tense, and so on.

I could also follow up with the choosing the wrong verb tense verb, and so on. I could also follow up with choosing the wrong verb tense and so on.

I could follow with the choosing the wrong tense, verb, and so on.! I could follow with choosing the wrong tense, verb, and so on!

The list is longer, but with all I commented here, I think it is enough to (have) get an idea. The list is longer, but with all I commented here, I think it is enough to (have) get an idea.

The list is longer, but with all I that I have commented on here, I think it is enough to get an idea.

The list is longer, but with all I commented here, I think it is enough to have an idea. The list is longer, but with all I commented here, I think it is enough to have an idea.

The list igoes longer, but with all I commente've said here, I think it's enough to havegive you an idea. The list goes on, but with all I've said here, I think it's enough to give you an idea.

The list is longer, but with all I commented here've already said, I think it's enough to haveget an idea. The list is longer, but with all I've already said, I think it's enough to get an idea.

Theis list iscould be longer, but with all I commented herethat being said, I think ithere’s enough to havehere to grasp an idea. This list could be longer, but with that being said, I think there’s enough here to grasp an idea.