No, the noun effort is an generally an uncountable noun that has no plural, a word for the force or energy required.
The only use for a plural is as a word for serious attempts or the activities of people who are working together to achieve a particular goal; for example:
The word effort is a noun. The plural form is efforts.
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
The plural of "she" is "they", so the plural of "she had" is "they had".
The plural form of effort is efforts.
The word effort is a noun. The plural form is efforts.
Effort is mostly used as a noun. However, the past tense of the verb form would be efforted.
No, you cannot put 's' to make 'effort' into plural form. Effort remains effort either it is one ore more effort.
There is no plural form. Do and Do not are verbs
The plural form of him, her, or it is them. (objective pronouns)
Bridges is the plural form of bridge.
The plural form of "was" is "were."
The plural form of "I" is "we."
The plural form of "is" is "are."
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.