The auxiliary verbs have and been are use before a present participle when creating the present perfect continuous. This is true for all subjects except third person singular.
Example:
Have is used as an auxilliary verb with other verb to form the past participle, present perfect, past perfect, past perfect continuous, future perfect continuous, future perfect and present perfect continuous, e.g. the use of have as an auxilliary verb with the verb go: Past Participle: Having gone present perfect: I have gone past perfect: I had gone past perfect continuous: I had been going future perfect continuous: I had been going future perfect: I will have gone present perfect continuous: I will have been going
Infinitive to has an obligation/mandatory kind of sense. Present participle simply describe on-going action. The present participle is the -ing form of a verb. It is used in continuous/progressive tenses. eg present continuous = am/is/are + verb +ing = He is waiting, they are watching past continuous = was/were +verb + ing = She was walking, they were sleeping present perfect continuous = have/has been + verb + ing = I have been waiting, she has been shopping. past perfect continuous = had been + verb + ing = They had been fishing, He had been sleeping
Present Perfect is a form that will use the verb ''to have" + past participle of the main verb. e.g I have walked.Present Perfect Continuous is a form that will use the verb ''to have'' + to be (past participle) +verb + ing. e.g I have been walking.
We use a past perfect continuous He said,"I have been reading for ages" In indirect speech it becomes, He said he had been reading for ages.
To convert the present perfect continuous tense into passive voice, use "has been" or "have been" followed by the past participle of the main verb. For example, "They have been cooking" in present perfect continuous becomes "Cooking has been being done by them" in passive voice.
A tense is a way of referring to a time (past, present or future) in language. Eg. if you say 'I have walked half a mile today', you are using the past tense because you have finished walking at the moment of speaking. Within each tense, there is a further subdivision: simple and continuous. If you want to stress the duration of the action of which you speak (the fact that it is/was/will be going on), you use the continuous. Here are some examples of every tense and its variations: present simple: I walk present continuous: I am walking present perfect simple: I have walked present perfect continuous: I have been walking past simple: I walked past continuous: I was walking past perfect simple: I had walked past perfect continuous: I had been walking future simple: I will walk future continuous: I will be walking future perfect: I will have walked future perfect continuous: I will have been walking
The future perfect continuous tense is used to talk about long actions before a point in the future.It follows this structure:Subject (I, we, etc) + Will + Have + Been + Present ParticipleFor example: I will have been traveling for ten hours.
There are two forms of the present perfect tense: simple present perfect (I have eaten) and progressive present perfect (I have been eating). Both forms use "have" or "has" with the past participle of the main verb to indicate an action that started in the past and has relevance to the present.
The word been is usually used after the word have or a form of the word, including has, will have, and had. You use has been as a present perfect continuous form. She has been working for three hours is an example of how to use has been.
"Been" is the past participle of the verb "be" and is used in perfect tenses (present perfect, past perfect, future perfect) to indicate completed actions or experiences. "Being" is the present participle of the verb "be" and is used in continuous tenses (present continuous, past continuous, future continuous) to show ongoing actions or states.
"Have been" is used in present perfect continuous tense to indicate that an action started in the past and is still ongoing. For example, "I have been working on this project for two hours." "Have being" is not a correct phrase in English grammar. Use "have been" in situations requiring present perfect continuous tense.
Present perfect continuous is formed by - have / has been verb + ing.have been waiting.But know is a state verb and state verbs are not usually used in the continuous form eg knowing.So probably you would never use have been knowing.I have been knowing him for 15 years is not correct.