Differences between Present Perfect Simple and Present Perfect Continuous

In contrast with the present perfect simple tense, which emphasizes the result of a completed action, the present perfect continuous tense focuses on the duration or the activity itself.

Another difference between these two tenses is that the present perfect simple might refer to a habitual action over an incomplete period of time.

If the present perfect simple is used for an action which started in the past and is still in progress in the present, a time expression is needed, while the present perfect continuous can be used with or without such an expression.

Peiodic chart

Tools

Must, may might could.

1. Today I arrived laate to school, I must have left home earlier.



2. Oh no! We're lost! We may have taken the wrong path.



3. It could have been better if you have taken my advice.



4. I might have lost my homework when I get off the bus.

Sentences using adjectives in spongebob squarepant's song.

1. You should wear an under skirt with that dress.
2. This game is so absorbent that is a real adiction.
3. I've got a yellow bird as my favorite pet.
4. Some women use a porous rock to clean cloths from fluff.
5. We travel some nautical miles for arriving to Cancún.
6. Most of children's converastions are nonsense
7. Laura Uriza Blog's has a picture of some yellow flowers
8. I've got some bread, It's on the table.

Technical Vocabulary

1. Alligator - A specialized tool attached to a hot stick used to tie a wire or cable into an insulator. (Caimán)
2. Autotransformer - A transformer in which at least two windings have a common section. They are use to either "buck" or "boost" the incoming line voltage. (Autotransformador)
3. Blackout - Complete interrupting of load to an electric utility customer or group of customers. (Apagón)
4. Circuit breaker - A device that can be used to manually open or close a circuit, and to automatically open a circuit at a predetermined level of over current without damage to itself. (Pastilla Termomagnética)
   
5. Conduit - A channel for holding and protecting conductors and cables, made of metal or an insulating material, usually circular in cross section like a pipe. Also referred to as Duct. (Tubería para cable)
6. Luminaire - A complete lighting unit consisting of a light source with a means of distribution (reflector and/or refractor), lamp positioning (socket), lamp protection (housing) and a provision for power connection. (Luminarias o lámparas fluorescentes)
7. AWG - American Wire Gauge: A measure of wire thickness (which also dictates cross-sectional area, and for a given material, ampacity). (Calibre de alambre Estadounidense)
   
8. Ampacity - The amount of current a conductor can carry without exceeding its specified temperature, in amperes. (Amperaje)
9. Relay - electromagnetic switching device consisting of an armature which is moved by an electromagnet to operate one or more switch contacts. (Relevador)
10. Three phase - It refers to one circuit consisting of three conductors where the current and voltage in each conductor (phase) is 120° out of phase with each other phase. (Sistema Trifásico)
    

My English Level According to IHMEXICO