That. Do not use that as an adverb.

Wrong: I did not think the book was that small.
Right: I did not think that the book was so small.

That there, this here, these here, those there. There and here, in all these expressions are worse than unnecessary.

Them there. Do not use them there for those.

Wrong: Bring me them there books.
Right: Bring me those books.

Three first, two first, etc. Do not say three first, but first three. There can be only one first.

Too. Do not use too alone before a verb or a participle.

Wrong: He is too excited to listen to you.
Right: He is too much excited to listen to you.

Very. Do not use very alone before a verb or a participle.

Wrong: You are very mistaken.
Right: You are very much mistaken.