Boys take longer to fully develop in the language department, but he should be saying full sentences by three. You need to talk outloud, sounds odd but like "I am going to put the dishes away", I used to have full blown conversations when it was just my daughter and myself during the day. I talked to her like she understood me so I wasn't looney and talked all the time to her as she got older. Identifying objects, like "See this cup, I am going to put it up here for now". If you are preparing a meal, talk him through it on what you are doing.
Take him to your local library, expose him to kids his own age. Preschool is a HUGE bonus in that area. He will get social skills and learn to communicate with other kids too.
Most libraries have story times. Make sure you expose him to lot's of different kids at the park, museums even just walking around the mall and play areas.
Reading to him daily, talk to him about the pictures, get him to interact about what he heard from the story. If you are concerned, have your Pediatrician evaluate him. Below are things he should be able to do, but take in mind all kids are different.
DEVELOPMENTAL STAGES
FROM 3 YEAR OLD to 4 YEARS OLD
Age: About 3 years
Motor Skills
*Climbs well.
*Walks up and down stairs, alternating feet.
*Runs with ease.
*Pedals a tricycle.
*Kicks a ball.
*Feeds self.
*Opens doors.
*Washes and dries hands by self.
*Makes vertical, horizontal, and circular strokes with a pencil or crayon.
*Screws and unscrews lids, jars, nuts and bolts.
*Turns a page in a book one at a time.
Cognitive Skills
*Attention span increases to about 3 minutes.
*Can remember what happened yesterday.
*Understands "now", "soon", and "later."
*Knows some numbers, but not necessarily in correct order.
*Completes puzzles with three or four pieces.
*Sorts objects by shape and color.
*Matches an object to a picture of that object.
*Laughs at silly ideas.
*Understands the concept of "one" and "two".
*Matches circles and squares.
*Understands physical relationships (on, under, over, in, out).
Social Skills and Language
*Uses three-five word sentences.
*Asks questions.
*Plays spontaneously with other children in a small group.
*Recognizes and understands most common objects and pictures.
*Repeats simple rhymes.
*Asks to use the toilet most times.
*Enjoys being read to.
*Imitates housework or other chores.
*Assigns roles in pretend play (mommy, daddy).
*Uses pronouns (I, you, me, we, and they) and some plurals.
*Knows her first and last name.
*Knows whether he is a boy or girl.
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Age: About 4 years
Motor Skills
*Hops and stands on one foot for a few seconds. .
*Catches a bounced ball much of the time.
*Tries to write name. .
*Draws a face..
*Tries to cut paper with blunt scissors.
*Attempts to button, buckle and snap but usually needs help.
*Dresses and undresses doll in clothing with large zippers, snaps, and laces. .
*Brushes teeth with help.
*Pours from a small pitcher.
*Can get himself started when on a swing and may be able to keep it moving.
*Tries to skip.
*Strings large objects.
*Begins to copy some letters.
Cognitive Skills
*Recognizes some colors.
*Wants to know what will happen next.
*Distinguishes between what is real and what is imaginary.
*Follow instructions with up to three commands (put the toys away, wash your hands, and get your coat).
*Identifies situations that could lead to happiness, sadness and anger. V *Colors with crayons or chalk.
*Counts up to five objects.
*Understands taking turns and may do so without being reminded.
*Understands "big," "little," "short," "tall".
*Can sort objects by shape or color.
*Social Skills and Language
Social Skills and Language
*Speaks clearly enough for strangers to understand.
*Has a large vocabulary and speaks in sentences of five or more words.
*Tells stories.
*Often prefers playing with other children.
*Wants explanations of "why" and "how".
*Changes the rules of play as he goes along.
*Likes to play "dress up."
*Separates from parent for short periods without crying.
*Beginning to master some basic rules of grammar (past tense, plurals).
*Shares when asked.
*Enjoys playing games like tag, hide and go seek, and duck duck goose.
*Likes to do things for himself.