You can fix your grammar issues. Start with this slideshow, then do a little review of the most common grammar errors. Have specific questions? Check out the specific grammar issues addressed in the Grammar section here on YourDictionary.
The basic rule is to always use a single subject with a single verb and a plural subject with a plural verb when writing in the present tense.
Incorrect Example: These clothes is too small for him.
Correct Example: These clothes are too small for him.
There are other rules for particular situations. Such as, when two subjects are seen as one element, then a singular verb should be used.
Incorrect Example: Corned beef and cabbage are a traditional Irish meal.
Correct Example: Corned beef and cabbage is a traditional Irish meal.
Incorrect Example: He went the furthest.
The problem with this example is that the reader doesn't know what he is being compared to . . . the furthest of all the runners? . . . the furthest he has ever gone?
Correct Example: He went the furthest of all the runners under age 45.
Incorrect Use of a Comma
Incorrect Example: Let's eat Mom.
Correct Example: Let's eat, Mom.
For more information and tips on how to use a comma, check out the YourDictionary article "Comma Rules."
Example: The team was unhappy because they knew they might lose the game.
Example: She always put her keys in the same place so that she would not lose them.
Loose is an adjective that means unbound or not tight.
Example: The dog's collar was loose so it slipped off its neck.
Example: The lack of rain will affect the growth of the plant.
Effect is a noun that means the result of something.
Example: The effect of the rain was renewed growth of the plant.
For more information and tips on using affect vs. effect, check out the YourDictionary article "Affect vs. Effect Grammar Rules."