1. Some strategies . . .

2. Slow writing

3. The man walked. (The main clause)
Change the noun.
Change the verb.
Add an expanded noun phrase.
Add a fronted adverbial.
Add a prepositional phrase.
Now change the sentence order to add impact.
Use punctuation to match your sentence structure.

4. As night fell, the dripping wet detective strode towards the subway.
Night fell as the dripping wet detective strode towards the subway.
The dripping wet detective strode towards the subway, as night fell.
Dripping wet, the detective strode towards the subway, as night fell.
The detective, dripping wet, strode towards the subway, as night fell.

5. WAGOLL
Goldilocks stared at the bear. She was speechless. Our heroine, shaking and petrified, pulled the cover up to her chin. Slowly, she opened her mouth to speak. Without moving, she looked towards the door. Would she be able to make her escape ? The bear, who was reaching out to touch her, suddenly spoke. “Stay !”
Write a sentence which includes your character and a verb
Write a sentence with only three words
Write a sentence with two adjectives joined by ‘and’ using commas for
parenthesis
Write a sentence with an adverb
Write a sentence that includes a preposition phrase
Write a sentence that includes a modal verb
Write a sentence with a relative clause
Write a sentence of one word only 

6. Building sentences using co-ordinating and subordinating conjunctions

7. Building sentences using co-ordinating and subordinating conjunctions
Co-ordinating conjunctions
Subordinating conjunctions
Useful for adding information
and so for
Useful for contrasting ideas:
but yet or nor
These go in the middle of a sentence.
Useful for explaining things
because if since
Useful for contrasting things
although despite while whereas
Useful for adding extra information about
someone or something
which who that
These can go at the start of a sentence or in the middle of a sentence.

8. Beginning to build an argument using coordinating conjunctions
Zoos are fun places to go and children about animals too.
Zoos exist to provide entertainment but the animals are not always well looked after.
Coordinating conjunctions
Connect two main clauses.

9. Beginning to build an argument- using subordinating conjunctions
Animals in cages are like people in prison because they have had their freedom taken away.
Zoos can be educational if children can learn all about how the animals live.
Subordinating conjunctions
connect a subordinate clause
to a main clause.

10. Zoos? Prison or Paradise?
Silent debate…

11. Zoos? Prison or Paradise?
“You can see lots of rare animals in zoo.”
“Yes, but they are not living in their natural environment.”

12. Beginning to build an argument
Now use some of the ideas from the silent debate in your writing
Zoos are fun places to go and…
Zoos exist to provide entertainment but…
Zoos exist to provide entertainment so…
Zoos can be entertaining yet…

13. Beginning to build an argument
Now try these…
Animals can go crazy being locked up because…
Animals in cages are like people in prison because…
Zoos can be educational if…
Zoos can be fun although…

14. Collaborative writing
Create a rhetorical question which includes a modal verb.
Create a command using powerful language.
Describe how the polar moves using a powerful verb.
Describe the polar bear in a sentence that begins with two adjectives.
Starting a sentence with an adverb, describe how the polar bear looks out at the crowd gathering.
Add a subordinate clause to this sentence to make it more descriptive. His pen is a lonely place.

15. Forlornly, the arctic creature gazes out with melancholy eyes.
Create a rhetorical question which includes a modal verb.
Create a command using powerful language.
Describe how the polar moves using a powerful verb.
Describe the polar bear in a sentence that begins with two adjectives.
Starting a sentence with an adverb, describe how the polar bear looks out at the crowd gathering.
Add a subordinate clause to this sentence to make it more descriptive. His pen is a lonely place.
Forlornly, the arctic creature gazes out with melancholy eyes.
His pen, which is a lonely place, can feel like a prison.
Isolated and depressed, he is trapped in a confined cage.
In what way could you save this poor polar bear ?
The glum polar bear trudges around its grimy cage.
Help to save this lonely polar bear from a life of misery.
How can we make this more succinct using conjunctions and higher level punctuation ?

16. Fast writing (@RobertsNiomi)
You have a paragraph of writing which is accurate in terms of punctuation and grammar. 
The children copy the paragraph down and have to be 100pc accurate, otherwise when it is peer marked, each error will earn +1 point. The idea is that they increase accuracy and improve their score, so eventually they will end up with zero. 
I always link the paragraph to English learning, so it's relevant. It also improves tracking skills.