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Typical errors:
He must to
She haven't to do this
Are you do this
Can he to do that
etcetcetc
Some of the most annoying grammatical mistakes that I do not like to see in my students' pieces of writing are those related to improper use of tense and subject-verb agreement. I do also loathe incorrect written irregular verb forms.
Most of the mistakes related to the usage of tenses.
grammer is the not only way to speak , i noticed as a second langauge speaker i used grammer better than natives , hence grammer is one of talking but not the only one.