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

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'.

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

No need to restate it is silly, it is inferred

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

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

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

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.

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.

To fForgetting 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!

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

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

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

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'.

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

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

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

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

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

I could follow with the 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 an idea.

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

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

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

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

I could follow with the choosing of 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 that I have commented on here, I think it is enough to get an idea.