I am not sure I understand the question completely but I'll give it a try. In French there is no distinction between simple and continuous form. These are peculiar to English. In French you would just use the simple form:
Je mange. = I eat. = I am eating.
I don't know what you mean by "perfect form"?
The perfect tense is constructed with avoir/être + past participle.
I return from the office. = I am returning from the office. = Je rentre du bureau.I have returned from the office. -- Je suis rentré du bureau.
If you wanted to say "I have been returning from the office." (i.e. present perfect continuous form) you'd use the imparfait in French:
I have been returning from the office. -- Je retournais du bureau.
Tenses in English and French don't always match 1:1.
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