Expressing Length of Time: It + Take

 This phrase is used to express the duration or length of time required to do something.

Here's a comprehensive breakdown:

1. Basic Structure

The fundamental structure for expressing length of time with "it takes" is:

It + takes / took / will take + (someone) + time + to + infinitive verb

 * "It": This is a dummy pronoun (sometimes called an "expletive it" or "preparatory it"). It doesn't refer to a specific noun but rather introduces the idea of time duration.

 * "takes / took / will take": The verb "take" conjugated according to the tense (present, past, future, etc.).

 * "(someone)": This is optional. If you want to specify who is doing the action, you can include an object pronoun (me, him, her, us, them, you) or a noun/name (John, the students).

 * "time": This is the duration (e.g., an hour, five minutes, a long time, several days).

 * "to + infinitive verb": This specifies the action for which the time is required.

2. Common Tenses and Examples

a) Simple Present: "It takes" (for general truths, habits, or typical durations)

 * It takes 20 minutes to walk to the station. (General truth)

 * It takes me a long time to finish my homework. (Habit)

 * How long does it take to learn a new language?

   * It takes years to become fluent.

b) Simple Past: "It took" (for past actions)

 * It took us three hours to drive from Istanbul to Bursa yesterday.

 * It took her a week to recover from the flu.

 * How long did it take you to build that model?

   * It took me about two days.

c) Simple Future: "It will take" (for future actions)

 * It will take about an hour to cook dinner.

 * It will take them some time to adjust to the new system.

 * How long will it take to repair the car?

   * It will take at least a day.

d) Present Perfect: "It has taken" (for actions that started in the past and continue to the present, or whose duration is relevant to the present)

 * It has taken me three months to write this book so far. (Still writing)

 * It has taken a lot of effort to get to this point. (The effort's effect is current)

 * How long has it taken them to decide?

   * It has taken them over two weeks.

e) Present Continuous: "It is taking" (for ongoing actions where time is currently being consumed)

 * It is taking longer than I expected to fix the computer. (It's still in the process of being fixed)

 * It is taking us all day to clean the house.

 * How long is it taking you to prepare for the exam?

f) Other Modals (can, could, should, might, etc.)

 * It can take ages to get a visa for some countries. (Possibility/general truth)

 * It could take a few more days to get the results. (Possibility)

 * It shouldn't take you more than an hour to complete this task. (Expectation)

3. Variations and Important Points

 * Omitting "(someone)": If the doer of the action is obvious or irrelevant, you can omit "someone."

   * It takes two hours to fly from London to Rome. (No need to specify "us" or "people")

 * Questions: To ask about duration, use "How long...?"

   * How long does it take to get there?

   * How long did it take them to build the pyramid?

 * Negative sentences:

   * It doesn't take long to learn the basics.

   * It didn't take her much effort.

 * "Time" can be general: You can use general terms for time like "a long time," "ages," "a while," "a bit," "forever" (informal exaggeration).

   * It takes a while to master a skill.

 * Alternative order (less common, but possible for emphasis): You can sometimes put the action first, but it often sounds less natural:

   * To get to the station takes 20 minutes. (Less common than "It takes 20 minutes to get to the station.")

4. Common Mistakes to Avoid

 * Missing "it": Don't say "Takes 20 minutes to walk." Always include "It."

 * Incorrect tense of "take": Ensure "take" matches the tense you are expressing (takes, took, will take, etc.).

 * Using gerund instead of infinitive: It's always "to + infinitive," not "-ing."

   * Incorrect: "It takes 20 minutes walking."

   * Correct: "It takes 20 minutes to walk."

 * Forgetting "to" before the infinitive:

   * Incorrect: "It takes me a long time finish my homework."

   * Correct: "It takes me a long time to finish my homework."

By mastering the "it takes" construction, you'll be able to express durations

 of time clearly and correctly in a wide range of situations.