What does below rebus means ?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

Using eight eights and addition only, can you make 1000?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What is the next number in this series?

4,12,84,3612....

Count the squares in the matchstick puzzle below?

Find the smallest sentence with all the English alphabet.

What does it mean?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?