Help the stressed party planner complete their text messages to a friend. Choose the correct words to complete the negative questions.

I'm officially panicking! Why didn't you order the cake yesterday?

Also, please tell me, aren't they arriving at 6 PM? We are not ready!

I'm officially panicking! Why didn't you order the cake yesterday?

Because "order" is a base verb referring to a finished time ("yesterday"), we use the past simple auxiliary "didn't". "Haven't" would need the past participle ("ordered"), and "weren't" does not fit with a base verb.

Also, please tell me, aren't they arriving at 6 PM? We are not ready!

Because "arriving" is a present participle (-ing verb), we use the "to be" auxiliary "aren't" to form the present continuous tense (used here for a future arrangement).