constraint_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="org.technobyte.layouts.MainActivity">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true">

        <TextView
            android:text="This is A"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/textView2"
            app:layout_constraintLeft_toLeftOf="parent"
            android:layout_marginStart="60dp"
            android:layout_marginTop="60dp"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:text="This is B"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/textView3"
            android:layout_marginStart="60dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView2"
            android:layout_marginTop="60dp" />

        <TextView
            android:text="This is C"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/textView4"
            android:layout_marginStart="60dp"
            app:layout_constraintLeft_toRightOf="@+id/textView2"
            android:layout_marginTop="60dp"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>
</RelativeLayout>