Present continuous
The present continuous tense is used for actions happening now or for an action that is unfinished. The present continuous tense is formed with the subject plus the present particle form (-ing) of the main verb and the present continuous tense of the verb to be: am, is, are (be (am, is, are) + verb + ing = present continuous).
Present progressive/continuous functions:
1. Present Continuous for action happening now:

a) for action happening exactly now: I am eating my lunch.
b) for action happening around now (the action may not be happening exactly now, but it is happening just before and just after now, and it is not permanent or habitual). They are building a new stadium in our city (the action is happening around now)
2. Present Continuous for fixed plans in the near future.
His parents are coming on Saturday.
Spelling rules:
a) if the syllable is stressed we double the last consonant and then add -ing.
commit - committing
swim - swimming
run - running
b) if the syllable is not stressed we don't double the last consonant.
open - opening
c) If the base verb ends in ie, change the ie to y.
lie - lying
die - dying
d) If the base verb ends in e, omit the e.
come- coming
Short/contracted forms of auxiliaries:
We often use short/contracted forms of auxiliaries in spoken English. The Present Progressive is formed with the auxiliary to be (am, are, is), so short/contracted forms are very frequent.
I'm getting                    
I'm not getting                               
you're gettingyou're not= you aren't getting
he's getting he's not= he isn't getting
she's getting   she's not= she isn't getting
it's getting it's not=it isn't getting
we're getting we're not= we aren't getting
they're gettingthey're not=they aren't getting