You open / You are opening.
I/You/We/They open. He/She/It opens. The present participle is opening.
past
Opened is the past tense of open.
No because one verb is past tense and the other is present tense. You should say "Yes, this sample has been opened and processed."
The present perfect tense of open is:I/You/We/They have opened.He/She/It has opened.
The verb is is the present tense.
Present perfect is formed this way - have/has + past participle. (not past tense)Singular subjectsThe hospital has opened a new wing - opened is past participle of openShe has written to him - written is the past participle of writePlural subjectsThey have seen the movie. - seen is the past participle of see.The boys have talked all night - talk is past participle of talk
The past tense of did is did. The present tense of did is do. The future tense of did is will do.
It was, (past tense) it is, (present tense) it will be( future tense)
Past tense I had Present tense I have Future Tense I will have
"Has" is in present tense. The past tense is "had".
No 'is' is present tense. am/is/are = present tense was/were = past tense