Living Sentences is a fun exercise for younger children to give them practice in the way sentences are put together.
On A4 sheets of paper write single words which will go to make up sentences which are an appropriate level for your class.
And so on. It's best to paperclip the words of each sentence together so you don't mix them up.
In class, go over the way in which sentences are constructed. Here you can concentrate on the kind of sentence your class is studying, for example making questions or negations or simple declarative sentences, etc.
As an example, get 5 students to the front of the class and give them each one word from the first sentence and have them stand in a group, holding the word they have above their head. Get the class to call out and tell those students where to stand in a line so that the sentence is formed properly.
With the younger students this is great fun and leads to a lot of enthusiastic noise!
Once the class is familiar with this you can: