4 класс WB, Afnasyeva, Vereshagina. Lesson 24-30.
Не могу понять задание на странице 29 №3:
write the three forms of verbs. divide them into three groups ([t], [d], [id]).
Даны слова: to laugh, to study, to join, to count, to work, to lock, to shout, to describe, to happen, to believe, to start.
[t]: to laugh - laughed - laughed. (две строки ниже)
[d]: to study - studied - studied. (три строки ниже)
[id]: to count - counted - counted (две строки ниже)

spasibo, ispravila

[t] -  work worked worked. lock locked locked. [d] - describe, described described, happen, happened happened, believe believed believed. join joined joined[id] - shout shouted shouted, start started started.  

[t]:to work-worked-workedto lock-locked-locked[d]: to join-joined-joinedto describe-described-describedto happen-happened-happenedto believe-believed-believed[id]: to shout-shouted-shoutedto start-started-startedЕсли слово на глухой согласный заканчивается, то звук [t], если на звонкую, то звук [d], а если на t или d, то звук [id]