When we add -ing to a verb we sometimes have to change the ending of the verb as well.
For verbs that end in 'e', we drop the 'e' before we add -ing.
smile smiling
stare staring
For verbs with a short vowel sound just before the last letter, we double the last letter before we add -ing.
plan planning
swim swimming
Otherwise, we usually just add -ing.
think thinking
lead leading
In this worksheet you will need to remember the different rules for adding -ing to verbs.
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