I think this paper should be accepted with minor revisions. Overall this paper makes a decent contribution to the field of instruction as it relates of linguistic instruction. Three things will improve this manuscript:
1) The conclusion is weak. You should clearly state the gap you research is filling and connect that well with the rest of the paper. Furthermore, you need to expand the limitations and future research section.
2) Good copy-editing will help this paper.
3) A few sentences in the literature about the type of results you expected to find before you conducted the experiment.

Good job. I think some copy-editing is needed, but apart from that. Good job.