1. Irregular Verbs: These verbs don't follow the typical pattern of adding "-ed" to form the past tense and past participle. They have unique forms, which can be confusing to learn. Examples include:
* Go - Went - Gone
* See - Saw - Seen
* Do - Did - Done
2. Verb Tenses: Different tenses of verbs can be tricky to use correctly, especially for learners of English. This includes:
* Present Perfect: (have/has + past participle) - indicates an action that started in the past and continues into the present or has a result in the present.
* Past Perfect: (had + past participle) - indicates an action that happened before another action in the past.
* Future Perfect: (will have + past participle) - indicates an action that will be completed before a specific time in the future.
3. Verb Moods: Moods describe the speaker's attitude towards the action expressed by the verb. The three main moods are:
* Indicative: (states a fact)
* Imperative: (gives a command)
* Subjunctive: (expresses a wish, doubt, or hypothetical situation)
4. Transitive and Intransitive Verbs:
* Transitive verbs: require a direct object (the thing receiving the action of the verb). Example: He threw the ball. (Ball is the direct object)
* Intransitive verbs: don't take a direct object. Example: She slept.
5. Phrasal Verbs: These are verbs combined with prepositions or adverbs, creating a new meaning. Example: Look up (to search for information), Take off (to leave). They can be tricky to learn because they don't always follow a predictable pattern.
If you can provide more context about what you mean by "troublesome verbs," I can give you a more specific answer.