In English, "by the end of" is a commonly used phrase to indicate that an action or state has been completed or occurred before a certain point in time. This phrase is often used to describe past, present, or future situations, but the voice used will vary.
First of all, when describing a past situation, the past perfect tense (had + past participle) is usually used after "by the end of" to indicate that an action or state has been completed or occurred before a certain point in the past.
For example, "by the end of last year, we had sold all the products."
In March 2024 (low starting point), I will take the PETS** contract full course.
Second, when describing the present situation, the simple present tense (verb primitive) is usually used after "by the end of" to indicate that an action or state is now taking place or existing.
For example, "by the end of this year, we will h**e finished all the work".
In addition, when describing a future situation, "by the end of" can be followed by the simple future tense (will + verb primitive) or the future perfect tense (will h**e + past participle), which indicates that an action or state will be completed or occur before a certain point in time in the future.
For example, "by the end of next year, we will h**e completed the project."
Also, it is important to note that "by the end of" can also be used with modal verbs to indicate speculation or possibility about the future.
For example, "by the end of next year, they might h**e finished the project."
Summary:
In English, "by the end of" is used to indicate that an action or state has been completed or occurred before a certain point in time, and can be used to describe a past, present, or future situation. According to different tenses and voices, the verb form after "by the end of" will be different, and the specific needs to be judged and selected according to the context and context.