Fix grammaticality of the sentence: The hardest thing for me are the articles, prepositions, and tenses.
The hardest thing for me is the article.
The hardest thing for me is the preposition.
The hardest thing for me is the tense.
The hardest thing for me is the verb.
The hardest thing for me is the subject.
The hardest thing for me is the verb.
The hardest thing for me is the object.
The hardest thing for me is the subject.
The hardest thing for me is the verb.
The hardest thing for me is the object.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.
The hardest thing for me is the article.