There are 2 different things going here, both are hidden implied subjects under discussion.
The subject will be made clear by the rest of the context of your communication and|or the modifiers you choose for certain words.
Your readers|audience must determine whether the implied subject is a SPECIFIC INSTANCE of an EVENT, or the implied subject describes what happens when the behavior or pattern takes place generally (what's the typical pattern that occurs?).
Specific Event Instance:
"I ate half of a cheesburger."
"I eat half of a cheeseburger."
(This is a correct but rare way to get your meaning across because your reader has to
notice the tiny difference between "ate" and "eat".) Be kinder to your reader: include
more signals that the implied subject is "General Pattern".
"I ONLY eat half of a cheeseburger AT A TIME."
A Specific Event Instance could take place in the past, present or future. The amount (and thus the plural or singular form of the object) needs to agree with the specific amount you discuss for that particular, individual, actual event:
"You ate 3 cheeseburgers for breakfast" == "You ate half of a cheeseburger for breakfast."
"You are eating 3 cheeseburgers for lunch" == "You are eating half of a cheeseburger for lunch."
"You will eat 3 cheeseburgers for dinner" == "You will eat half of a cheeseburger for dinner."
But the General Pattern (discussing the general pattern all events usually follow) uses the infinitive form of the verb, AND the singular or plural that matches the form of the CATEGORY that the object word belongs to:
"I eat cheeseburgers." == An individual cheeseburger is an instance of "cheesburgers",
so we use the category.
"I drive trucks." == An individual truck falls within the "trucks" category.
"I eat bread with butter." == An individual LOAF of bread belongs to the "BREAD" category
So first you have to identify whether the Subject is [Specific Event Instance] or [General Template For This Behavior-Occurrence Pattern], and then IF it is General Pattern, is the object's CATEGORY plural or singular?