"Bacteria" is a noun. Nouns don't have tenses.
The correct phrasing is "did not manage," as "managed" is the past tense of the verb "to manage."
The correct phrase is "had shown." This is the past perfect tense of the verb "show."
"Shrunk" means to become smaller in size, typically as a result of heat or water. It is the past tense of the verb "shrink."
Cilia are many short hair-like structures on the surface of a cell that help move the cell or move substances past the cell. They can be found in various types of cells, including those lining the respiratory tract to help sweep mucus and foreign particles out of the lungs.
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense of "she do" is "she did."
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would" and the past tense of "be" is "was" or "were" depending on the subject (singular or plural).
HAD is the Past Tense of TO HAVE.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
The past tense of "have" is "had."
The past tense of "you will not" is "you would not."
The past tense of "exist" is "existed." The past perfect tense is "had existed."