Present tense Vs Past tense

Which sentence is in the simple present tense?

• The machine operates efficiently under high pressure.

• The machine operated efficiently last year.

• The machine is operating efficiently right now. 

• The machine has operated efficiently since its installation.

Choose the correct sentence in simple present tense

• Engineers have designed new tools for the project. 

• Engineers design new tools for various projects. 

• Engineers were designing new tools. 

• Engineers are designing new tools.

Which sentence is in the simple past tense?

• The turbine operates efficiently.

• The turbine operated efficiently during the last test. 

• The turbine is operating efficiently

• The turbine has been operating for hours. 

Identify the sentence in simple past tense

• The engineer calibrated the machine last night.

• The engineer calibrates the machine every week. 

• The engineer is calibrating the machine now. 

• The engineer has calibrated the machine. 

Which sentence is in the present continuous tense?

• They are testing the engine's performance right now. 

• They tested the engine's performance last week. 

• They have tested the engine's performance before. 

• They were testing the engine's performance. 

Which sentence is in the present continuous tense?

• The team is working on the new prototype.

• The team worked on the new prototype last year. 

• The team works on the new prototype every day. 

• The team has worked on the new prototype. 

Which sentence is in the past continuous tense?

• The technician was assembling the motor when the manager arrived.

• The technician assembled the motor yesterday. 

• The technician has assembled the motor. 

• The technician is assembling the motor right now. 

Choose the correct past continuous tense sentence:

• I was reviewing the blueprints while they were testing the equipment.

• I am reviewing the blueprints while they test the equipment.

• I reviewed the blueprints while they tested the equipment.

• I have reviewed the blueprints while they have tested the equipment

Which sentence is in the present perfect tense?

• The engineers have improved the engine's fuel efficiency. 

• The engineers improved the engine's fuel efficiency last year. 

• The engineers are improving the engine's fuel efficiency. 

• The engineers were improving the engine's fuel efficiency. 

Choose the correct present perfect tense sentence

• She has completed the mechanical design.

• She completed the mechanical design last month. 

• She is completing the mechanical design right now. 

• She was completing the mechanical design.