When you are teaching the children a new conversation/sentence and don't want to get bogged down with grammatical explanation simply write the new sentence in colours on the board.

For example...

This activity helps those students who find it difficult to put simple sentences together.

You can also use Cuisenare (?) rods and give each colour a job. The children can arrange the rods in front of them and see how the words fit together visually.

'Fairhead' has commented... In addition we give each type of word an action to appeal to the kinaesthetic learners so they can colour code or 'act out' a sentence in the correct sequence.