Concern, concerns, concerned, concerning

CONCERN - PRESENT SIMPLE
★ i concern
★ you concern
★ he/she/it concerns
★ we concern
★ you concern
★ they concern
CONCERN - PRESENT CONTINUOUS
★ i am concerning
★ you are concerning
★ he/she/it is concerning
★ we are concerning
★you are concerning
★ they are concerning
CONCERN - PRESENT PERFECT
★ i have concerned
★ you have concerned
★ he/she/it has concerned
★ we have concerned
★ you have concerned
★ they have concerned
The Simple Past Tense, also called Simple Past or Preterite is a verb tense that is used to describe completed action happened in the past. It is the most basic form of past tense and it is formed by adding d, ed or ied to the base structure of the verb.
Present Simple is a tense used for talking about habits or activities that are constantly repeating. We also use Present Simple if we are talking about general thrust or facts about nature. This tense is also used in the Zero Conditional sentences and it is one of the most basic but also most important tenses of the English language. The most used prepositions with Present Simple are OFTEN, USUALLY, ALWAYS and many more.

CONCERN - PRESENT PERFECT CONTINUOUS
★ i have been concerning
★ you have been concerning
★ he/she/it has been concerning
★ we have been concerning
★ you have been concerning
★ they have been concerning
CONCERN - PAST SIMPLE
★ i concerned
★ you concerned
★ he/she/it concerned
★ we concerned
★ you concerned
★ they concerned
CONCERN - PAST CONTINUOUS
★ i was concerning
★ you were concerning
★ he/she/it was concerning
★ we were concerning
★ you were concerning
★ they were concerning
CONCERN - PAST PERFECT
★ i had concerned
★ you had concerned
★ he/she/it had concerned
★ we had concerned
★ you had concerned
★ they had concerned
A transitive verb always has a noun that receives the action of the verb, called the direct object.
An intransitive verb never has a direct or indirect object. Although an intransitive verb may be followed by an adverb or adverbial phrase, there is no object to receive its action
CONCERN - PAST PERFECT CONTINUOUS
★ i had been concerning
★ you had been concerning
★ he/she/it had been concerning
★ we had been concerning
★ you had been concerning
★ they had been concerning
CONCERN - FUTURE SIMPLE
★ i will concern
★ you will concern
★ he/she/it will concern
★ we will concern
★ you will concern
★ they will concern
CONCERN - FUTURE CONTINUOUS
★ i will be concerning
★ you will be concerning
★ he/she/it will be concerning
★ we will be concerning
★ you will be concerning
★ they will be concerning
CONCERN - FUTURE PERFECT
★ i will have concerned
★ you will have concerned
★ he/she/it will have concerned
★ we will have concerned
★ you will have concerned
★ they will have concerned
Present Perfect Continuous is a tense in the English language used to emphasize that one action is still continuing in the present moment. The difference between Present Perfect and Present Perfect Continuous is that Present Perfect is emphasizing the action of the sentence while Present Perfect Continuous is emphasizing the duration of that action.
CONCERN - FUTURE PERFECT CONTINUOUS
★ i will have been concerning
★ you will have been concerning
★ he/she/it will have been concerning
★ we will have been concerning
★ you will have been concerning
★ they will have been concerning

conjugation of verb concern