The object of the verb can be identified by a noun, proper name or a pronoun. In the sentence "Jacob helped a man" the noun "man" is the object of the verb. In "Jacob helped John" the proper name "John" is the object and in "Jacob helped him" the pronoun "him" is object of the verb. The object of the verb works the same way in Hebrew such as in the sentences עזר יעקב יוחנן (azar Ya'aqov Yohhanan) meaning "Jacob helped John." When the object of the verb is identified by a pronoun it may be written in two different ways. The word אתו (oto) means "him" and can be used for the object of the verb such as in the sentence עזר יעקב אתו (azar Ya'aqov oto) meaning "Jacob helped him." Or the suffix ו (o), also meaning "him," may be attached to the end of the verb such as in the sentence עזרו יעקב (azaro Ya'aqov) also meaning "Jacob helped him."
It is not uncommon for the verb, subject of the verb and the object of the verb to be written as one word in Hebrew. The Aaronic blessing (Numbers 6:24) begins with the word יברכך (yevarekhekha) which is the verb ברכ (barak), meaning "to bless" with the prefix י (ye) identifying the subject of the verb as third person, masculine, singular - he and the suffix ך (kha) identifying the object of the verb as second person, masculine, singular - you. Therefore, the one word יברכך means "he will bless you."
Below is a list of the pronoun suffixes attached to a verb for the object of the verb. (These pronouns are also used as suffixes for nouns as well.)