"Open" is already in the present tense.
There is indeed a schwa sound in the word 'open'. [ˈəʊ.pən]
I/You/We/They open. He/She/It opens. The present participle is opening.
The word opened is a verb. It is the past tense of the verb "open".
"Now" is a word for in the present
The simple present tense is do.
Past - was and were. Present - am, is and are.
The present participle is opening.
"Has" is in present tense. The past tense is "had".
the word "was" is in the past, but the present tense of "was" is are
the present prticiple of the word study is studying
The present tense of clung is cling
Have is already present tense.