Be careful with some words when adding -ing to the infinitive. Remember these important rules:
1) consonant + vowel + consonant (except y/w) at the end of the word –> last consonant x 2. Examples: sit – sitting, put – putting.
We also double one -l at the end of the word. Example: travel – travelling
2) one -e at the end of the word, the -e disappears:
Examples: write – writing, take – taking.
BUT remember, double –e: add -ing. Example: see-seeing
Careful, verbs ending in -ie, change -ie into -y before adding -ing. Example: lie – lying
3) verbs ending in -c, change ‘c’ to ‘ck’. Example. picnic – he is picnicking
