八年级英语牛津版8B Unit 1 完美备课资源包（21份打包）

Unit 1 Past and present Grammar Present perfect tense We use the present perfect tense to talk about an action that started in the past and continues to the present. I have lived here since I was born. We use the present perfect tense to talk about an action that happened in past and has a connection with the present. Eddie has just eaten Hobo's food. (Eddie ate the food, and now Hobo has nothing to eat.) We also use the present perfect tense to talk about how many times an action has happened till now. I have already read this book many times. We can use these time expressions with the present perfect tense. already yet ever never Just recently since for Tip We make positive statements in the present perfect tense like this: I/You/We/They have arrived. He/She/It has We make negative statements in the present perfect tense like this: not have not = haven’t has not = hasn’t Tip I/You/We/They have arrived. He/She/It has We ask and answer questions using the present perfect tense like this: Have I/you/we/they arrived? Has he/she/it Yes, I/you/we/they have he/she/it has No, I/you/we/they haven’t. he/she/it hasn’t We form the past participles of regular verbs by adding -ed, just as what we do to form the simple past tense of these verbs. Most verbs + ed finish finished Verbs ending in -e + d change changed Verbs ending in a consonant +y -y + ied carry carried Short verbs ending in a vowel + a consonant Double the consonant + ed stop stopped We form the past participles of irregular verbs differently. Here are some examples. No change come come hurt hurt Change the vowel hold held win won Change the consonant lend lent build built Change the vowel (s) and the consonant (s) catch caught keep kept forget forgotten tell told others be been have had fall fallen fly f