I/you/we/they shop. He/she/it shops. The present participle is shopping.
Past continuous is formed by was/were + verb + -ing
was/were shopping
I was shopping last weekend
They were shopping last weekend.
The past participle (and simple past) is shopped.
shopped.
First of all, it should be "I went to the shop/shops", in general - you need a Definite Article (THE) after a preposition. The Present Tense form: "I go to the shop/shops". The Past Continuous form ("I was going to the shop") can be turned into a Present Continuous sentence: "I am going to the shop".
The past tense is schooled. The past continuous tense is 'was/were schooling'.
The past tense of "need" is "needed," and the past continuous tense is "was needing" or "were needing." For example, "I needed some help yesterday" (past tense) and "I was needing assistance when you arrived" (past continuous tense).
The past tense of awake is awoke and the past continuous tense is was/were awaking.
The past continuous tense of "appear" is "was appearing" or "were appearing."
Simple past tense. Past perfect tense. Past perfect continuous tense. Past continuous tense.
The past continuous tense of be is:I/She/He/It was being.You/We/They were being.
The past continuous tense is was/were having.I/He/She/It was havingWe/You/They were having
The past continuous tense of get is:I/He/She/It was getting.You/We/They were getting.
The past tense of "go" is "went." The past continuous tense of "go" is "was going" or "were going."
The past continuous tense of study is:I/He/She/It was studying.You/We/They were studying.
The past continuous tense of buy is:I/He/She/It was buying.You/We/They were buying.