Grammar & Sentence Completion

The present perfect negative is used to describe an action that has not happened up to the present moment.. The instruction applies when the parcel is still missing by Friday, so a present-perfect negative expressing a non-event is required.

Use 'as' to give a reason (because) in the sentence.. The clause gives the reason for arriving early, so a cause connector meaning 'because' is needed.

'As' introduces a causal clause meaning 'because', which fits the meaning that arriving early is needed because the registration desk closes promptly. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Students often pick 'although' or 'unless' thinking it signals a condition, but those change the logical relationship and are incorrect here.
• !Many candidates may mistakenly choose a simple present or future form, not realizing that these do not convey the idea of an action that was expected to happen but did not. The present perfect tense is often confused with other tenses, leading to incorrect choices.

Answer each from memory — you'll see instantly whether you're right and why.

Run a focused 10-question mini-mock on Grammar & Sentence Completion and see it stick.