More Sound-alike Words.

The verb to lie is a homonym, two words with the same spelling but with two completely different meanings.

One of those meanings is to tell an untruth.
The conjugation of that verb is straight forward.
Today I lie.
Yesterday I lied.
Often I have lied. (Well, let's amend that to say: I have never lied. That's a lie.)

The second word of the same spelling is to lie as in ''to lie down.''
Making matters worse, that second word to lie is often confused with the verb to lay.
Here's the correct usage: You always lie your own body down and you always lay something else down. But this second lie gets a little tricky on the past tense:
Today I lie down for a nap.
Yesterday I lay down for a nap at 2:00 p.m.
Often I have lain down at that time; it suits me.
Notice lie/lay/lain is always intransitive; it is never something you do to something else.
Lay is always a transitive verb when used as a present tense verb; it is always something you do to something else.
Today I lay the book on the table. (It's something you're doing to the book, so it's transitive. That's the meaning of the term, ''a transitive verb.'' The verb carries the action.)
Yesterday I laid the book on the table.
Often I have laid the book on the table. (This ''Today... Yesterday... Often...'' thing is a verb-conjugation format I grew up with in elementary school. The third one is a way of indicating repetitive action in the past. Did you grow up with the same format? I wonder. It's actually quite strange. Stranger still if we all grew up with it. Even stranger if I made it up without knowing I made it up. That would be really strange.)

You can memorize these verb conjugations if you like, but I don't recommend it. It seems more important to me that you remember which verbs can lead you astray so you can look those up and make sure they're right whenever you use them. (Or you can choose to avoid using them like a lot of us do. I put the book down. I took a nap. Look, Ma! Perfect!)

Some people mix up Sit and set, particularly when writing in past tense.
Sit is something you do, usually on or in a chair.
Set is something you or someone else does to something else. Just as with lie and lay, sit is always intransitive; set is always transitive.
Using sit is easy enough:
Today I sit down.
Yesterday I sat down.
Often I have sat down.
But set can trip you up on the past tense:
Today I set down the book.
Yesterday I set down the book. (Not sat down the book.)
Often I have set down the book.

Here are some others to round out this month's selection:
A dollop is a lump or blob of some viscous liquid like jelly or grease.
A trollop refers to a slovenly or wanton woman.
A polyp is a tumorous growth.
A solipsism is a theory that holds that the self is the only thing that can exist.

Forward means advanced or ahead.
Foreword is a preliminary in a book

Wait means to serve or, as a noun, a length of time one stays in one place.
Weight is a measurement of how much something weighs.

Heard is the past tense of hear.
Herd is a group of animals.

Later is something that comes after.
Latter is something that comes last in a series.