First of all, you should gain an understanding of their level of English, many non-native Speakers actually have a native level of English.
If you feel that your speaker struggles to understand you, you should speak clearly, not use slang or short forms (cannot rather than can't, going to rather than gonna) and use more simple words.
The crime category is called crimes of omission.
Crimes of omission is an offence that is categorized by<em> a person's failing to perform an act that is required or is seen as that person's legal duty. </em>
Some examples of crimes of omissions are child neglect, manslaughter by gross negligence and failure to disclosure terrorists acts.
Another example: a person who is aware of a dangerous situation such as a house on fire in progress, can face criminal charges for not notifying authorities.
The Germanic General that seized control of Rome was Odoacer
