The basic difference is that 'let's get started' is right, and 'let's get starting' is wrong, it's not possible. However, you can say: 'let's get going'. The problem is (I think!) that let's get + ~ing.
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The basic difference is that 'let's get started' is right, and 'let's get starting' is wrong, it's not possible. However, you can say: 'let's get going'. The problem is (I think!) that let's get + ~in...
