Researching the Rebus

(a) Rebus- Using pictures to replace a similar word or phrase.
(b)

This rebus has a picture of a arrow pointing at the word 'aid', which there are three of. This rebus means First Aid, since the arrow is pointing at the first aid.

 This rebus is showing three words, FREE, A, and 4. Then there is a picture of a bee, with a + R, and an ear +Y. This rebus says "Free beer for a year".

This rebus shows a happy face, a bird-D= a sundae-the sun, a 2, and a U. This rebus says Happy Birthday to you!

(c) 

 This rebus says "I love you".

This rebus says "My dear child, I received you letter of tuesday