Useful Letter Phrases: Choose the Missing Word

Choose the missing word

Letter of complaint

I am writing to complain ..... the service I received at your restaurant.

for

about

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Set phrases carry a formal letter, and most of the mistakes in them are one small word: complain for instead of complain about, look forward to hear instead of look forward to hearing. Each question shows which kind of letter the phrase comes from.

After look forward to, apologise for and thank you for the verb takes -ing: I look forward to hearing from you, Thank you for inviting me.