Present Perfect Simple and Continuous

• We use the present perfect simple to talk about completed actions and results. We use the present perfect continuous for ongoing actions that started in the past and continue now.
• Tense
• Form
• Use
• Example
• Simple
• have/has + past participle
• Completed action, result
• I have written three functions.
• Continuous
• have/has + been + verb-ing
• Ongoing action, duration
• She has been debugging all morning.
• Remember
• Use present perfect simple with state verbs (know, seem, need).
• Use present perfect continuous to emphasize the duration of an action.
• Use 'for' with a period of time and 'since' with a point in time.
• Examples
• We have refactored the entire codebase.
• Mark has been working on the spike for two days.
• Common mistakes
• I have know him for three years.
• I have known him for three years.

Complete the sentences

• Kevin (work) ____ on the monolith in Seattle since Monday.
• We (restructure) ____ the database in Austin already.
• Sarah (write) ____ five unit tests this afternoon.
• They (experiment) ____ with new frameworks in Boston.
• I (clean up) ____ the legacy code in Chicago.
• David (port) ____ the app to the cloud for hours.

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