…and my sister noticed two tadpoles in the pond.
How it is made: notice ends in e, so add only d — notice + d = noticed.
Why noticed and spotted look so different: They follow two different spelling rules. Spot is short and ends in a vowel + a consonant, so the t is doubled. Notice already ends in e, so only a d is added.
All ten blanks of Exercise E together:
Remember: Not all verbs take -ed. Verbs like came, drank, drove and saw change their whole shape. The book calls them irregular verbs.
My own sentence: I noticed a new bird nest in our neem tree.