I found the following sentence from Youtube. Please someone tell me whey they use "would have" in the following sentence. In fact, the only place where I know to use the "would have" is with third conditionals. By in this case, it is not a hypothetical situation. Therefore, I would really appreciate it if someone could explain what is the usage of "would have" in the following sentence. Actually, I know it is feasible to remove "if clause", if it is understandable through context. However, in this case there isn't such evidence.
Eventually, Genghis would have four sons with Borte, and though during the course of his rule he would take many other wives and have many other children, Borte alone would remain his lifelong companion.
" "would" is future in the past. Genghis married his first wife, Borte. They had four children.
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It is the normal use of "have." "would" is future in the past.
Genghis married his first wife, Borte. They had four children.
Borte gave birth to a son, Jochi, in 1182. Later she would bear / would have / would give birth to three more children. Would shows an action in the future relative to 1182, but in the past relative to 2019.