Preschool children :

• 3 & 4 year old's learn best when they are moving. Adults learn best when sitting down and concentrating. This is NOT true for children. If they want to stand, walk, jump, play with a fidget toy, make crafts, listen to stories, and/or sing, let them.

Kids learn best through playing– let kids be kids!
The more senses they use the more they will learn and retain the information. A 3 year old child should not be expected to sit down and be quiet for long periods of time.

• Your 3 year old…

will say 3 to 4 words together - I want juice. Follows 3-part directions, like get the doll, feed it, and put it to bed. Understands and asks questions, like Where is the toy?
Describes activities, feelings and problems, and tells simple stories.

• Your 4 year old…

Uses sentences that are longer and more complete, such as “I want to go to the park.” 
Uses more grammar, like pronouns (I, you, me, she, he, we), past tense (walked), and some question words (what, who, where, why). However there may still be some errors.
Most 4 year old's do not know how to share. It is a skill they are still learning– please be patient.
Articulation

• Your 3 year old…
  Uses sounds like m, p, b, w, t, d, n, h, k, g, f, s, vowels, y as in yes, and ing as in sing.
  Is understood by parents between 75 to 100% of the time. 
• Your 4 year old…
  Uses sounds like m, p, b, w, t, d, n, h, k, g, f, y, l, s, z, vowels, and ing.
  Is understood by parents 100% of the time.
• Your 5 year old…
  Says most sounds correctly except for maybe r, v, ch, and th.
  Uses l blends and s blends, such as blue and stop.
  May say s, z, sh, ch, or j with the tongue sticking out (a lisp).
  Is easily understood by siblings, friends, parents, and strangers.
•  Modeling correct speech and grammar is great tool parents can use when speaking with their kids!

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Information excerpts taken from www.parentlink.com - talkbox