When forming a contraction with the verb 'to be', we can use the simple present tense of the verb. ... Here are some examples: "I'm going to sit a writing exam at 2 o'clock on Thursday." ...

In the present simple, regular verbs end in -s or -es, but -y changes to -i. marry – marries study – studies In the present continuous, all verbs end in -ing, but sometimes the spelling changes.