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How to use ergo
Know what " ergo " means.
The term " ergo " can be defined to mean " as a result " or " for that reason. "
Similar words include " therefore, " " hence, " " consequently, " " so, " " thus, " and " accordingly.

Options: 1). " " hence, " " accordingly, " " therefore, " and " accordingly, " are equally different words. Spelling and grammar confusions can be confusing as well.. 2). " Understand what " ergo " stands for. " generally speaking, " ergo " stands for " as a result " or " for reason ", so " ergo " stands for " as a result " or " to a cause.. 3). " you can use " ergo " when describing the relationship between a cause and an effect. Example: i love reading; ergo, i have a large library at home.. 4). " this line may be changed in the future, because a little bit of work will be required. If your current understanding of " ergo " means something beyond " therefore, " that does not mean a bit of work is required to be done..
Answer:
3).