Don’t say: 
– There are many differents flavors.
– I went to the market and bought some differents things.
– I like to meet people from differents countries.

Say this:
– There are many different flavors.
– I went to the market and bought some different things.
– I like to meet people from different countries.

Remember:

• Different is an adjective, which describes a noun.  “Three”, “blue”, “happy”, and “strong” are all adjectives.
• Adjectives are always singular, even when the noun they modify is plural.
• You would not say: “I saw two blues cars.”  or “There are many strongs women.”
• Say: I saw two blue cars.  There are many strong women.
  I have a different idea.  I have two different ideas.
• There is an English word that sounds very similar to differents – It’s “difference“,  which is a noun that describes what is different between one person/thing and another.

Don’t say: 
– Where you work?
– What she likes to eat?
– How much it costs?
– Why they come late every day?
– What this means?

Say this:
– Where do you work?
– What does she like to eat?
– How much does it cost?
– Why do they come late every day?
– What does this mean?

Remember – for Present Tense Questions:

• Include do or does as an auxiliary verb with most main verbs
  • Use do with I, you, we, they
  • Use does with he, she, it
• The main exceptions include:
  • Verb to be (Is he happy? not: Does he happy? not: Does he is happy?)
  • Modals like can/could/should (Can you drive a truck?  not: Do you can drive a truck?)
• When you use do/does as auxiliary verb in a question, the main verb is always in its base form
  • “like“, not “likes”  (base verb is to like)
  • “cost“, not “costs” (base verb is to cost)
• Look here to review the correct order of words in a question

Don’t Say
– Remember me to make a doctor’s appointment tomorrow.
– That song remembers me of our trip to Cape Cod.
– I reminded that I have to work on Tuesday.
– I reminded to pick up milk at the store.

Say This:
– Remind me to make a doctor’s appointment tomorrow.
– That song reminds me of our trip to Cape Cod.
– I remembered that I have to work on Tuesday.
– I remembered to pick up milk at the store.

Remember (Don’t forget):

• Remember  
  • is the opposite of “forget”
  • Remember is something you think about from your own memory – it’s internal
  • Remember + something
    • I remembered your birthday.
    • I remember the first day we met.
  • Remember + to (She remembered to call her mother.)
  • Remember + that (I remembered that there is no school today.)
  • YouGlish examples of remember (also remembers and remembered)
• Remind
  • Remind is to help someone remember something – it’s external
  • Remind + someone + to
    • Carla, please remind me to do my homework
    • I have to remind my father to take his medicine.
  • Remind + someone + of
    • That smell reminds me of springtime.
    • That dog reminded me of the dog I had when I was a boy.
  • YouGlish examples of remind (also reminds and reminded)

Below is more explanation especially for Portuguese speakers (one here for Spanish speakers, and one more for everyone)