The present perfect simple and the present perfect continuous are the tenses used to talk about actions, behaviour, or situations that began in the past and are complete or still continuing at the present moment. The present perfect simple consists of a form of ‘have’ and a past participle, for example the verb group ‘have bought’ in the sentence ‘I’ve bought the tent so let’s go camping!’ The present perfect continuous consists of a form of ‘have’ followed by ‘been’ and a present participle, for example ‘has been living’ in the sentence ‘My niece has been living with us all her life’.
The tense used to talk about habitual actions, behaviour, or situations that happened or existed before now. The simple past of regular verbs consists of the infinitive with “-d” or “-ed” added, for example “arrived” in the sentence “She arrived yesterday“. The auxiliary “did” is used in questions and negatives, for example in the sentences “Did you see that?” and “Sometimes his plans did not succeed“.