What two types of grammatical errors is a nonnative speakers English likely to make?

It's hard to pinpoint just two, as non-native speakers make a wide variety of grammatical errors depending on their native language, exposure to English, and individual learning patterns. However, two common types of errors are:

1. Article Usage: This includes using the wrong article (a, an, the) or leaving one out entirely. This can be challenging because English article usage is complex and often doesn't follow consistent rules. For example, a speaker might say "I went to store" instead of "I went to the store."

2. Tense and Verb Forms: Non-native speakers often struggle with verb tenses, especially past perfect, present perfect, and future tenses. They might use the wrong verb form, like saying "I eated" instead of "I ate," or have difficulty with irregular verbs.

It's important to remember that these are just two common types, and many other errors occur. Additionally, non-native speakers may make mistakes in:

* Prepositions: Using the wrong preposition ("on" instead of "at," "in" instead of "to").

* Word Order: Incorrectly placing words in a sentence, especially with adjectives and adverbs.

* Pronoun Usage: Misusing pronouns like "I" and "me," or using the wrong form (e.g., "he" instead of "him").

* Subject-Verb Agreement: Failing to match the verb to the subject in number.

Overall, it's important to remember that language learning is a gradual process, and making mistakes is a natural part of it.