When do we use will?, To say what we think will happen in the present or future, make predictions, spontaneous decisions, and promises., We use "will" to talk about events that happened in the past and are now finished., When do we use be going to?, We use "be going to" for spontaneous, on-the-spot decisions made at the moment of speaking., We use "be going to" to talk about future plans and intentions, especially when the decision has already been made before the moment of speaking. It is also used to make predictions based on strong present evidence., When do we use If?, We use "if" to talk about something that is certain to happen in the future., To introduce conditional clauses, When do we use Would?, We use "would" to talk about definite future events that are certain to happen, particularly when giving a direct command., Use "would" to talk about hypothetical or unreal situations, express polite requests or preferences, describe past habits, and indicate a future action from a past perspective., What's an automated trolleys?, Machine or computer operated carts, Is a manual cart that must be physically pushed..

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