TO ASSIST - [verb] to help
Examples of use
We are expected to assist the guests with interpreting during the conference and their free time.
Foreign armies arrived to asist in restoring peace.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her