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(from THOMSON AND MARTINET A Practical English Grammar.
Purpose is expressed in final claues
1. through an infinitive with TO:
ex: I've come this far TO SEE you play.
2. with SO AS or IN ORDER TO
2.1. SO AS NOT TO very frequently with negative clauses.
ex: He spoke quietly SO AS NOT TO wake the baby.
2.2. IN ORDER TO to refer the infinitive to the subject:
ex: He took off his shoes and socks in order to walk comfortably on the wooden floor.
3.FOR +______ING form
expresses the purpose of a thing:
ex: A lawn mower is a machine to cut the grass of your garden
|4. SO THAT +||WILL/WOULD|
|ex: Modern cars come with an estabililty system so that drivers will feel safer.|
|CAN/COULD||these forms are used whenever the person referred to is mentioned|
|ex: We brought a second pair of socks so that the children could change after playing.|
|MAY/MIGHT (+ formal)|
|ex: We made a copy of all the papers so that the judge might keep them|
|5. IN ORDER +||MAY/MIGHT---MIGHT/SHOULD|
|note that this form is also possible
when another subject is implied but the tenses are more restrictive.
ex: I explained that a couple of times in order that everybody might understand it perfectly
|6. IN CASE +||SUBJECT + VERB||means "por si" in Spanish"|
|6.1 present tense + in case + present tense/should + infinitive|
|ex: I always take the umbrella in
case it rains
it should rain
|6.2 past tense + in case + past tense or should|
|ex: I took the umbrella in case it should rain/rained|