As an English teachers, how do you teach full sentences to 3 years old kids?

Demonstrate by the pictures with sounds and teach the child by making rhymes of the sentence.

THROUGH SOUNDS ,,, MAKE THE ACCENT CLEAR SO THAT STUDENT CAN MAKE THE SPELLINGS THROUGH SOUNDS ,,,,   TEACHER MUST SPEAK ENGLISH IN CLASS ,,, LISTENING OF ANY LANGUAGE MAKES LEARNING FAST & EASY.  GOOD DAY 

First of all we should know that a3 year kid have to understand and speak a sentence of3 words. So, you have to teach him first how to speak single words, then sentences of2 words, then3 word sentences. You can't teach him a full sentece at age of3 years old (Unless his IQ is higher than his colleagues)

agree with MADAM SHAGUFTA ZAFAR,,,

By use of familiar visual or pictorial storylines  the3year oldscan learn much faster and more effectively. then give them a chance to re-tell the story.

Visually teach a child letter make words and words make sentences .