General "remember":
* நினை (Ninai) - This is the most common and general way to say "remember."
* நினைவு (Ninaivu) - This literally means "memory" but can also be used as a verb meaning "to remember."
"Remember to..." (with an imperative):
* நினைச்சுக்கோ (Ninaicchukko) - This is a more colloquial way to say "remember to..."
* நினைத்து (Ninaiththu) - This is a more formal way to say "remember to..."
"Remember that..." (with a statement):
* நினைத்துக்கோ (Ninaiththukko) - This is a more colloquial way to say "remember that..."
* நினை (Ninai) - This is a more formal way to say "remember that..."
Other variations:
* மறக்காதே (Marakkaadhe) - This literally means "don't forget" and is a stronger way of saying "remember."
* மனசுல வச்சுக்கோ (Manasula vacchuko) - This means "keep it in your mind" and implies a strong effort to remember something.
The best way to choose the right word depends on the context and the specific meaning you want to convey.