Explanations:In English grammar, verbs are categorized into regular and irregular verbs. Regular verbs follow a predictable pattern when forming their past tense and past participle forms, typically by adding "-ed" to the base form. For example, the regular verb "walk" becomes "walked" in both the past tense and past participle. However, irregular verbs do not follow this pattern and have unique forms that must be memorized.
The question "If we come across problems, they will have to be ....." requires the use of the past participle form of a verb that fits the context of addressing or dealing with problems. The correct answer is "tackled," which is the past participle form of the irregular verb "tackle." The verb "tackle" means to deal with or address a problem directly, making it the most appropriate choice in this context.
Let's examine the other options to understand why they are incorrect:
Option B, "taken," is the past participle of the regular verb "take." While "take" can mean to deal with something, it is not as specific as "tackle" in the context of addressing problems. "Taken" implies a more passive action of receiving or accepting something, which does not fit the context of actively dealing with problems.
Option C, "missed," is the past participle of the regular verb "miss." "Miss" means to fail to catch, see, or hit something. It does not fit the context of addressing problems at all, as it implies a failure to notice or encounter something.
Option D, "planned," is the past participle of the regular verb "plan." While planning can be part of addressing problems, the context suggests a more immediate action of dealing with problems. "Planned" implies making arrangements in advance, which is not as direct as "tackled" in the context of addressing problems.
Understanding the context and the specific meaning of each verb is crucial in selecting the correct past participle form. In this case, "tackled" is the most appropriate choice because it directly conveys the action of addressing or dealing with problems.