BUBBLE - PRESENT SIMPLE
★ i bubble
★ you bubble
★ he/she/it bubbles
★ we bubble
★ you bubble
★ they bubble
BUBBLE - PRESENT CONTINUOUS
★ i am bubbling
★ you are bubbling
★ he/she/it is bubbling
★ we are bubbling
★you are bubbling
★ they are bubbling
BUBBLE - PRESENT PERFECT
★ i have bubbled
★ you have bubbled
★ he/she/it has bubbled
★ we have bubbled
★ you have bubbled
★ they have bubbled
The Simple Past Tense, also called Simple Past or Preterite is a verb tense that is used to describe completed action happend in the past. It is the most basic form of past tense and it is formed by adding d, ed or ied to the base structure of the verb.
Present Perfect is a tense used to express the activity that started in the past and is still going on in the present tense. In British English this is the most used tense of them all. When you want to tell about your experience up to the present, you use Present Perfect. The prepositions that are often used with this tense are NEVER, EVER, JUST, ALREADY, YET and many others.
BUBBLE - PRESENT PERFECT CONTINUOUS
★ i have been bubbling
★ you have been bubbling
★ he/she/it has been bubbling
★ we have been bubbling
★ you have been bubbling
★ they have been bubbling
BUBBLE - PAST SIMPLE
★ i bubbled
★ you bubbled
★ he/she/it bubbled
★ we bubbled
★ you bubbled
★ they bubbled
BUBBLE - PAST CONTINUOUS
★ i was bubbling
★ you were bubbling
★ he/she/it was bubbling
★ we were bubbling
★ you were bubbling
★ they were bubbling
BUBBLE - PAST PERFECT
★ i had bubbled
★ you had bubbled
★ he/she/it had bubbled
★ we had bubbled
★ you had bubbled
★ they had bubbled
A transitive verb always has a noun that  receives the action of the verb, called the direct object.
An intransitive verb never has a direct or indirect object. Although an intransitive verb may be followed by an adverb or adverbial phrase, there is no object to receive its action
BUBBLE - PAST PERFECT CONTINUOUS
★ i had been bubbling
★ you had been bubbling
★ he/she/it had been bubbling
★ we had been bubbling
★ you had been bubbling
★ they had been bubbling
BUBBLE - FUTURE SIMPLE
★ i will bubble
★ you will bubble
★ he/she/it will bubble
★ we will bubble
★ you will bubble
★ they will bubble
BUBBLE - FUTURE CONTINUOUS
★ i will be bubbling
★ you will be bubbling
★ he/she/it will be bubbling
★ we will be bubbling
★ you will be bubbling
★ they will be bubbling
BUBBLE - FUTURE PERFECT
★ i will have bubbled
★ you will have bubbled
★ he/she/it will have bubbled
★ we will have bubbled
★ you will have bubbled
★ they will have bubbled
Present Continuous is a tense used for activities that are happening in the moment of speaking. It also can be used in a future aspect for future arrangements or plans. This tense is always used when you are describing a picture. The most used prepositions used with Present Continuous are AT THE MOMENT and NOW.
BUBBLE - FUTURE PERFECT CONTINUOUS
★ i will have been bubbling
★ you will have been bubbling
★ he/she/it will have been bubbling
★ we will have been bubbling
★ you will have been bubbling
★ they will have been bubbling

Conjugation of verb Bubble