⏳ English Tenses Mastery
2ème BAC Sciences et Technologies Elécriques STE
📌 Introduction
This lesson covers all 12 English tenses with scientific context:
Time Frames
- Present
- Past
- Future
Aspects
- Simple
- Continuous
- Perfect
- Perfect Continuous
Scientific Application: “We use different tenses to describe experiments, observations, and predictions in science.”
🔬 Present Tenses
Simple Present
“Water boils at 100°C”
Scientific facts & habitual actions
Present Continuous
“The researcher is analyzing data now”
Ongoing actions
Present Perfect
“Scientists have discovered a new element”
Completed actions with present relevance
Present Perfect Continuous
“The team has been working on this project for months”
Duration of ongoing actions
🧪 Exercise: Present Tense Identification
Match each sentence to its correct present tense:
1. “The chemical reaction produces heat”
2. “They are testing the hypothesis”
3. “We have verified the results”
📜 Past Tenses
Simple Past
“Marie Curie discovered radium”
Completed actions
Past Continuous
“The researcher was observing the sample”
Ongoing past actions
Past Perfect
“The team had completed the experiment”
Actions before other past actions
Past Perfect Continuous
“They had been studying the phenomenon”
Duration before another past action
🔍 Exercise: Past Tense Timeline
Sequence these events using past tenses:
First action:
Second action:
Example context: “When the results were published (simple past), the team had already moved to new research (past perfect)”
🔮 Future Tenses
Simple Future
“The satellite will launch next month”
Predictions & scheduled events
Future Continuous
“Scientists will be monitoring the data”
Ongoing future actions
Future Perfect
“By 2030, we will have developed a vaccine”
Completed future actions
Future Perfect Continuous
“The project will have been running for 5 years”
Duration of future actions
🚀 Exercise: Future Predictions
Convert these present scientific facts to future predictions:
| Present Fact | Future Prediction |
|---|---|
| “Solar panels convert sunlight to energy” | |
| “Researchers study climate change” |
🧩 Mixed Tenses Practice
🔀 Exercise: Tense Conversion
Convert this paragraph to the specified tense:
Original (Present Simple): “Scientists conduct experiments. They analyze data. They publish results.”
🎯 Exercise: Scientific Report Editing
Correct the tense errors in this lab report excerpt:
“Yesterday we observe the reaction. It is producing gas. Tomorrow we recorded the results.”
📝 Tense Review Quiz
1. Which tense describes ongoing actions at a specific past time?
2. “By 2050, renewable energy ___ fossil fuels.” (replace)
3. Complete the sequence:
After the team ___ (complete) the research, they ___ (publish) the findings.
