They are all used to show how things or people are the same.
1. Always use "too" at the end of a positive sentence.
- She likes hip-hop. I like hip-hop too.
- Mark is tall. Bill is tall, too.
- Gary has two sisters. Ben has two sisters, too.
Use "also" after a "be verb" if there is one in the sentence.
- Tina is tired. I am also tired.
- Josh is smart. His brother is also smart.
- Greg was sick yesterday. Mary was also sick yesterday.
- Mary is sleeping. Bill is also sleeping.
- He likes pizza. I also like pizza.
- She lives in the city. He also lives in the city.
- Greg works here. Vicky also works here.
- She will go. I will also go.
- They should come. You should also come.
- It might rain today. It might also rain tomorrow.
Always use "either" at the end of the sentence when it used this way.
- She isn't tall. Her brother isn't tall either.
- Mary doesn't work here. Tim doesn't work here either.
- Peter wasn't happy yesterday. Ben wasn't happy either.
- We can either go to the beach or go to the mountain.
- We can eat either fish or chicken.
A) I hate this.
B) Me too.
A) I have a cat.
B) Me too.
A) I haven't seen that movie.
B) Me either.
A) Sally hasn't come to class in a long time.
B) Tim either.
5. When we are writing, we can use a comma before "too" or "either", but we do not need to do this. It is the writer's choice.
- All of my friends have a puppy. I want a puppy too.
- All of my friends have a girlfriend. I want a girlfriend, too.
"Too" and "also" are used only with affirmative sentences. These are sentences that do not have the word "not".
Put "too" at the end of a sentence.
- Mary likes it. I like it too.
- Bill is fast. Mark is fast too.
- She is tall. He is also tall.
- My brother exercises here. Mark also exercises here.
- I will go. She will also go.
- I don't like it. She doesn't like it either.
- Ben didn't come. Mary didn't come either.
A) I have a car.
B) Me too. / Me also.
A) Mary didn't come to the meeting.
B) Tim either.
Understanding how these three words are used will help your English sound more natural. Practice using these words the next time you write in English or have a conversation in English. If you practice a little, you will learn to use these three words correctly in no time!