Can someone check these sentences for grammar and context?

1. Tu n'as rien (as in you don't have anything).
2. Nous ne voulons acheter rien dans ton magasin (as in we don't want to buy anything in your store).
3. Tu ne peux pas aider moi (as in you can't help me).
4. How can I say I don't have clothes in a certain size in French?

To check these sentences for grammar and context, let's analyze each one individually:

1. "Tu n'as rien."
This sentence is grammatically correct and translates to "You don't have anything" in English. It is a simple negative statement using the verb "avoir" (to have).

2. "Nous ne voulons acheter rien dans ton magasin."
This sentence contains a grammar error. The correct way to express "We don't want to buy anything in your store" in French is "Nous ne voulons rien acheter dans ton magasin." In French, the negation "rien" should generally be placed before the verb "acheter."

3. "Tu ne peux pas aider moi."
This sentence also has a grammar error. The correct way to say "You can't help me" in French is "Tu ne peux pas m'aider." In French, the pronoun "me" is combined with the verb "aider" using an indirect object pronoun "m'".

4. To say "I don't have clothes in a certain size" in French, you can use the following phrase:
"Je n'ai pas de vêtements dans une certaine taille."
In this sentence, "Je" means "I," "n'ai pas" means "don't have," "de" is used to indicate "some/a certain," "vêtements" means "clothes," "dans" means "in," and "une certaine taille" means "a certain size."

Remember, when checking sentences for grammar and context, it's crucial to review the grammar rules, pay attention to proper word order, and ensure that the words and phrases chosen convey the intended meaning accurately.