“I’m good” is not an error. “She sings good” is. The line between them is the same one that decides “I feel bad”.

Every one of these is a correctly spelled word, so nothing will flag it. The only defence is knowing the trick for each.

One takes an object and one does not, which would be simple except that the past tense of “lie” is “lay”. English did this on purpose to no one.

One means repeatedly, the other means without stopping. A handful of near-identical pairs carry real distinctions, and a handful carry none at all.

The whole comprises the parts. The parts compose the whole. And “is comprised of” is the construction that starts arguments.

The speaker implies. The listener infers. Confusing them is common enough that some dictionaries now record the error, which does not make it a good idea.

One introduces information you can remove; the other introduces information the sentence needs. The comma is not decoration — it changes the meaning.

Affect is usually the verb, effect is usually the noun, and the exceptions are rare enough to learn individually.

Everyone knows sentences and names. The trouble is job titles, seasons, directions, and the compulsion to capitalise anything that feels important.

It marks something left out, or it marks a sentence trailing away. It does not mean “and so on”, and it is not a general-purpose pause.