The sentence structure in focus is a conditional sentence, often described as a third conditional, which is used to talk about hypothetical situations in the past.
To correctly construct a third type conditional sentence, the format used typically is: If + past perfect, would + have + past participle.
Let's analyze the options:
- If you would have taken care you wouldn’t have got typhoid. - Incorrect: The structure deviates from the correct third conditional format.
- If you took care you wouldn’t have got typhoid. - Incorrect: This uses a simple past tense instead of past perfect.
- If you take care you wouldn’t have got typhoid. - Incorrect: This mixes present tense with past hypothetical consequences.
- If you had taken care you wouldn’t have got typhoid. - Correct: This follows the proper third conditional structure (i.e., past perfect for the condition and "would have" for the result).
Thus, the best construction is: If you had taken care you wouldn’t have got typhoid.