how to express... purpose!

Grammar Tables: 

for, to, so that

To talk about purpose, 

or the reason why we do things, 

we can use  for + verb-ing, 

we can use the infinitive with to, 

and we can use so that + subject + verb.

Action or event	'for' + verb-ing
I'm bringing some pots and pans	for cooking.
I've got special glasses	for reading small print.
A thermos flask	is for keeping hot food hot.

Action or event	Infinitive with 'to'
We've got some water	to make tea.
I went to the shops	to buy some milk.
I worked very hard	to get a promotion.

 

Action or event	'so that' + subject + verb
I'm taking some extra blankets	so that we don't get cold.
I chained my bicycle to the fence	so that it wouldn't get stolen.
I worked very hard	so that I would do well in the exam.

CONNECTORS (addition & contrast)

ADDITION

Type of Connector	Connector(s)	Examples
Coordinating Conjunction	and	High level positions are stressful at times, and can be harmful to your health.
Conjunctive adverbs	in addition,  furthermore, moreover, also, besides, also, too	High level positions are stressful at times; furthermore, they can be harmful to your health
Correlative conjunctions	not only...but also	Not only are high level positions stressful at times, but they also can be harmful to your health.
Prepositional phrases	in addition to, as well as	Als weel as being stressful, high level positions can also be harmful to your health.

CONTRAST

Type of Connector	Connector(s)	Examples
Coordinating conjunction	but, however, nevertheless	High level positions are stressful at times, but the financial rewards make these positions very desirable indeed.
Subordinating conjunctions	whereas, while	While high level positions are stressful at times, the financial rewards make these positions very desirable indeed.
Conjunctive adverbs	in contrast, on the one hand, on the other hand even though, though, although,	High level positions are stressful at times; on the other hand, the financial rewards make these positions very desirable indeed.Even though high level positions are stressful at times, the financial rewards make these positions very desirable indeed.
Prepositions	despite, in spite of	In spite of the stress high level positions may cause, the financial rewards make these positions very desirable indeed.