Past indefinite tense
Neither: RAN (the second form of a verb is its Past Tense); as for your suggestions, only HAS RUN is correct, but it's a Present Perfect (you use the auxiliary HAVE + the third form = the Past Particle of the respective verb).
To form the simple past tense of a verb you need to make the verb past tense. For regular verbs, you add -ed to the end of the verb. Irregular verbs are different in that there is no pattern to forming their past tense form. You must learn their past tense.To form the complete simple past tense you should use this formula:Subject + Past Tense Verb.For example:I danced. (dance is a regular verb)I sang. (sing is an irregular verb)To form the simple future tense you should follow this formula:Subject + Will + VerbFor example:I will play.I will go.
"Will" is necessary as an auxiliary verb to form the normal future tense of a base verb in the second and third persons and the emphatic future tense in the first persons. "Will" can also be a substantive verb itself, with substantially the same meaning as "want".
To use simple tense verbs, simply conjugate the verb according to the subject and tense. In present simple tense, add an 's' for third person singular subjects (he, she, it). In past simple tense, typically add '-ed' for regular verbs or use the irregular form. In future simple tense, use 'will' + base form of the verb. Remember to use the base form of the verb for all other subjects.
Yes, you should use a past participle after the verb "have" to form the present perfect tense. For example: "I have eaten," "She has studied."
No, a thesaurus is used to find synonyms and antonyms of words, not to determine the past tense of a verb. To find the past tense of a verb, you can consult a verb conjugation chart or a grammar resource.
The form of the verb provides this information, although sometimes it needs to be clarified. There are some verbs (such as read) that use the same spelling for the present tense and the past tense. Example: He runs is the present tense. (He is running) He ran is the past tense. (He was running) He will run is the future tense. (He will be running)
The word "how" isn't a verb and so doesn't have a past tense. The word itself can't determine a tense in a sentence.
To use "eager" in the past tense, you would say "I was eager" or "he/she/they were eager." "Eager" remains the same in its base form in past tense, and you just need to add the appropriate form of the verb "to be" before it.
Decision is a noun. The verb form is decide, and the past tense is decided.
When you form the Negative and the Interrogative of a Past Tense verb, you use the auxiliary TO DO in the Past Tense = DID + the Short Infinitive of the respective verb (the Infinitive minus TO). The information that we are dealing with a Past Tense is included in the auxiliary verb, so we don't need to use the Past Tense of the main verb, too. Therefore, you should say "didn't see", not "didn't saw".
If you use the wrong verb form or the wrong tense then your writing will not 'sound' correct when people read it. For example:They buy a car yesterday. -- this is the wrong verb tense buy should be past tense (bought) because the action happened yesterday.The cat was chase by the dog. -- this is the wrong verb form. Passive verb phrases are be+past participle, should be was chased.