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Your best friend is struggling to carry five heavy boxes up the stairs. Select ALL the phrases that correctly use "will" to make a helpful offer.
The correct answers are I'll grab a couple of those for you! and I will help you carry those upstairs!
When we volunteer to do something for someone or offer our help, we use will (usually contracted to 'll in spoken English).
"I am going to watch you drop those" is certainly a choice, but it uses "going to" (and isn't very helpful!).