The past tense refers to actions that have already happened. For example, "she is walking" refers to a girl who is currently walking (present tense), while "she walked" refers to a girl who was walking before now (past tense).
1. No longer current; gone by; over: His youth is past. 2. Having existed or occurred in an earlier time; bygone: past events; in years past. 3. a. Earlier than the present time; ago: 40 years past.
In summary: To keep past and passed straight, remember that past always has the same form, while passed is one of the forms of the verb pass. By putting a sentence in the future tense you can see which you want.
History is the systematic study of the past, focusing primarily on the human past. As an academic discipline, it analyses and interprets evidence to construct narratives about what happened and explain why it happened. Some theorists categorize history as a social science, while others see it as part of the humanities or consider it a hybrid discipline. Similar debates surround the purpose of ...