Verbs

The main forms of the verb "be" are "be," "is," "am," "are," "was," "were," "been," and "being."

Yes, "help" can function as an action verb when it describes the action of assisting someone or doing something to make a situation better. For example, "I helped my friend with her homework."

The future perfect tense of "reach" is "will have reached."

Yes, began is a verb, as in the action "to have began".

It is the past-tense of begin.

A verb is a word that describes either an action (walk, run, etc), an occurrence (become, happen, etc) or state of being (stand, exist, etc).

"On the beach" is a phrase, not an independent clause. It does not express a complete thought and cannot stand alone as a sentence.

Present tense - go

Past tense - went

Future tense - will go

The word cut is both present tense and past tense because you can use it in something that has happened, happening or going to happen. It's also a future tense.

The prepositional phrase in the sentence is "under the desk."

The verb of avoidance is avoid.
Other verbs depending on tenses are avoids, avoiding and avoided.

Some example sentences for you are:
"I must avoid Sally because I forgot her bracelet".
"She avoids her teacher's gaze, hoping he won't pick her next to do the class speech".
"I am avoiding my mum because she won't be happy about the stain on my shirt".
"She totally avoided me today".

The past tense of "jump" is "jumped."

Using the word sprang in a question can be tricky.

"Are you saying Fluffy sprang on you and scratched your arm?" the elderly woman asked as she petted her tiny kitten.

The police officer had difficulty keeping a straight face while asking the intoxicated man questions, especially about the man's attacker. "So you say the ghost sprang up from behind a bush and knocked you to the ground? Can you describe the ghost for my report?"

The girl sprang from her chair, looked out the window, then paced about the room. The boy who asked her to the prom was over an hour late to pick her up.

My heart sprang into a rapid beat when my best friend scared me late last night.

People are described by adjectives, not verbs.

You use "s" with verbs in the simple present tense when the subject is he, she, or it. For example, "He eats," "She studies," "It runs."

The word yesterday is a noun, because it states a time. It does not describe an action...

It is either a verb or adjective - it is the past tense and one past participle (along with stricken) of the verb "strike". Examples:

The car struck him. (verb)

A struck coin, a struck batter, a struck pedestrian (adjective)

I believe it is sprung, as in 'He had sprung into action.' The simple past tense of "spring" is "sprang".

The past tense of "serious" is "seriously."

The past perfect tense of "stop" in the given sentence would be: "The storm had stopped in the early afternoon."

The past indicative form is "did" and the past participle is "done".

The word what've is a contraction, a shortened form for 'what have', an pronoun and a verb. The contraction performs as an auxiliary verb, for example 'what've you been doing...' (you have been doing what).

Yes, it is a verb. It means to appear again after leaving, or vanishing.

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