I will paste the whole paragraph for the sake of context:
Let us first restate the question of how we acquire: given the correctness of the natural order hypothesis, how do we move from one stage to another? If an acquirer is at "stage 4", how can he progress to "stage 5"? More generally, how do we move from stage i, where i represents current competence, to i + 1, the next level? The input hypothesis makes the following claim: a necessary (but not sufficient) condition to move from stage i to stage i + 1 is that the acquirer understand input that contains i + 1, where "understand" means that the acquirer is focused on the meaning and not the form of the message.
I would expect to have the verb conjugated with the singular form (i.e. understands). However, the words "is that" may play a role changing the grammar form, or may not.
Could you please tell me what you think about this?
Thank you all!
What do you like to do on weekends or what do you like to do on the weekends?
or even what do you like to do on the weekend?
What do you think?
Thank you!
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Have a great day!
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